[DoWhile] Add in then region blocks while2for

```mlir
#alias_scope_domain = #llvm.alias_scope_domain, description = "_ZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_">
#tbaa_root = #llvm.tbaa_root
#alias_scope = #llvm.alias_scope, domain = #alias_scope_domain, description = "_ZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_: %matElemlist">
#alias_scope1 = #llvm.alias_scope, domain = #alias_scope_domain, description = "_ZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_: %ss">
#alias_scope2 = #llvm.alias_scope, domain = #alias_scope_domain, description = "_ZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_: %vdov">
#alias_scope3 = #llvm.alias_scope, domain = #alias_scope_domain, description = "_ZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_: %arealg">
#alias_scope4 = #llvm.alias_scope, domain = #alias_scope_domain, description = "_ZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_: %dev_mindtcourant">
#alias_scope5 = #llvm.alias_scope, domain = #alias_scope_domain, description = "_ZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_: %dev_mindthydro">
#tbaa_type_desc = #llvm.tbaa_type_desc}>
#tbaa_type_desc1 = #llvm.tbaa_type_desc}>
#tbaa_type_desc2 = #llvm.tbaa_type_desc}>
#tbaa_tag = #llvm.tbaa_tag
#tbaa_tag1 = #llvm.tbaa_tag
module attributes {dlti.dl_spec = #dlti.dl_spec = dense<32> : vector<4xi64>, i64 = dense<64> : vector<2xi64>, i128 = dense<128> : vector<2xi64>, !llvm.ptr = dense<64> : vector<4xi64>, i1 = dense<8> : vector<2xi64>, i8 = dense<8> : vector<2xi64>, i16 = dense<16> : vector<2xi64>, i32 = dense<32> : vector<2xi64>, f16 = dense<16> : vector<2xi64>, f64 = dense<64> : vector<2xi64>, f128 = dense<128> : vector<2xi64>, "dlti.endianness" = "little", "dlti.legal_int_widths" = array>, llvm.target_triple = "nvptx64-nvidia-cuda"} {
llvm.comdat @__llvm_global_comdat {
llvm.comdat_selector @_Z34CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_S1_S1_ any
}
llvm.mlir.global internal unnamed_addr @_ZZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_E12s_mindthydro() {addr_space = 3 : i32, alignment = 8 : i64, dso_local, sym_visibility = "private"} : !llvm.array<128 x f64> {
%0 = llvm.mlir.undef : !llvm.array<128 x f64>
llvm.return %0 : !llvm.array<128 x f64>
}
llvm.mlir.global internal unnamed_addr @_ZZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_E14s_mindtcourant() {addr_space = 3 : i32, alignment = 8 : i64, dso_local, sym_visibility = "private"} : !llvm.array<128 x f64> {
%0 = llvm.mlir.undef : !llvm.array<128 x f64>
llvm.return %0 : !llvm.array<128 x f64>
}
llvm.func local_unnamed_addr ptx_kernelcc @_Z34CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_S1_S1_(%arg0: i32 {llvm.noundef}, %arg1: f64 {llvm.noundef}, %arg2: f64 {llvm.noundef}, %arg3: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.readonly}, %arg4: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.readonly}, %arg5: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.readonly}, %arg6: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.readonly}, %arg7: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.writeonly}, %arg8: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.readnone}, %arg9: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.writeonly}, %arg10: !llvm.ptr {llvm.noalias, llvm.nocapture, llvm.nofree, llvm.noundef, llvm.readnone}) comdat(@__llvm_global_comdat::@_Z34CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_S1_S1_) attributes {convergent, dso_local, frame_pointer = #llvm.framePointerKind, no_unwind, passthrough = ["mustprogress", "norecurse", ["no-trapping-math", "true"], ["nvvm.maxntid", "128"], ["nvvm.minctasm", "16"], ["stack-protector-buffer-size", "8"], ["target-cpu", "sm_60"], ["uniform-work-group-size", "true"]], target_cpu = "sm_60", target_features = #llvm.target_features<["+ptx85", "+sm_60"]>} {
%0 = llvm.mlir.addressof @_ZZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_E12s_mindthydro : !llvm.ptr<3>
%cst = arith.constant 9.9999999999999995E-21 : f64
%cst_0 = arith.constant 0.000000e+00 : f64
%cst_1 = arith.constant 1.000000e+20 : f64
%1 = llvm.mlir.addressof @_ZZL40Inner_CalcTimeConstraintsForElems_kernelILi128EEviddPiPdS1_S1_S1_S1_E14s_mindtcourant : !llvm.ptr<3>
%c64_i32 = arith.constant 64 : i32
%c32_i32 = arith.constant 32 : i32
%c16_i32 = arith.constant 16 : i32
%c8_i32 = arith.constant 8 : i32
%c4_i32 = arith.constant 4 : i32
%c2_i32 = arith.constant 2 : i32
%c0_i32 = arith.constant 0 : i32
%2 = llvm.addrspacecast %0 : !llvm.ptr<3> to !llvm.ptr
%3 = llvm.addrspacecast %1 : !llvm.ptr<3> to !llvm.ptr
llvm.intr.experimental.noalias.scope.decl #alias_scope
llvm.intr.experimental.noalias.scope.decl #alias_scope1
llvm.intr.experimental.noalias.scope.decl #alias_scope2
llvm.intr.experimental.noalias.scope.decl #alias_scope3
llvm.intr.experimental.noalias.scope.decl #alias_scope4
llvm.intr.experimental.noalias.scope.decl #alias_scope5
%thread_id_x = gpu.thread_id x
%4 = arith.index_castui %thread_id_x : index to i64
%5 = arith.index_cast %4 : i64 to index
%6 = arith.index_cast %4 : i64 to index
%7 = arith.index_cast %4 : i64 to index
%8 = arith.index_cast %4 : i64 to index
%9 = arith.index_cast %4 : i64 to index
%10 = arith.index_cast %4 : i64 to index
%11 = arith.index_cast %4 : i64 to index
%12 = arith.index_cast %4 : i64 to index
%13 = arith.index_cast %4 : i64 to index
%14 = arith.index_cast %4 : i64 to index
%15 = arith.index_cast %4 : i64 to index
%16 = arith.index_cast %4 : i64 to index
%17 = arith.index_cast %4 : i64 to index
%18 = arith.index_cast %4 : i64 to index
%19 = arith.index_cast %4 : i64 to index
%20 = arith.index_cast %4 : i64 to index
%21 = arith.index_cast %4 : i64 to index
%22 = arith.index_cast %4 : i64 to index
%23 = arith.index_cast %4 : i64 to index
%24 = arith.index_cast %4 : i64 to index
%25 = arith.index_cast %4 : i64 to index
%26 = arith.index_cast %4 : i64 to index
%27 = arith.index_cast %4 : i64 to index
%28 = arith.index_cast %4 : i64 to index
%29 = arith.index_cast %4 : i64 to index
%30 = arith.index_cast %4 : i64 to index
%31 = arith.index_cast %4 : i64 to index
%32 = arith.index_cast %4 : i64 to index
%33 = arith.index_cast %4 : i64 to index
%34 = arith.index_cast %4 : i64 to index
%35 = arith.index_castui %thread_id_x : index to i32
%block_dim_x = gpu.block_dim x
%36 = arith.index_castui %block_dim_x : index to i32
%block_id_x = gpu.block_id x
%37 = arith.index_castui %block_id_x : index to i64
%38 = arith.index_cast %37 : i64 to index
%39 = arith.index_cast %37 : i64 to index
%40 = arith.index_castui %block_id_x : index to i32
%41 = arith.muli %36, %40 : i32
%42 = arith.addi %41, %35 : i32
%43 = arith.cmpi slt, %42, %arg0 : i32
%44:2 = scf.if %43 -> (f64, f64) {
%grid_dim_x = gpu.grid_dim x
%54 = arith.index_castui %grid_dim_x : index to i32
%55 = arith.muli %54, %36 : i32
%56 = arith.addi %42, %55 : i32
%57:5 = scf.while (%arg11 = %56, %arg12 = %cst_1, %arg13 = %cst_1, %arg14 = %cst_1, %arg15 = %cst_1) : (i32, f64, f64, f64, f64) -> (i32, f64, f64, f64, f64) {
%58 = arith.subi %arg11, %55 : i32
%59 = arith.index_cast %58 : i32 to index
%60 = "enzymexla.pointer2memref"(%arg3) : (!llvm.ptr) -> memref
%61 = memref.load %60[%59] {alias_scopes = [#alias_scope], alignment = 4 : i64, noalias_scopes = [#alias_scope1, #alias_scope2, #alias_scope3, #alias_scope4, #alias_scope5], ordering = 0 : i64, tbaa = [#tbaa_tag]} : memref
%62 = arith.index_cast %61 : i32 to index
%63 = arith.index_cast %61 : i32 to index
%64 = arith.index_cast %61 : i32 to index
%65 = "enzymexla.pointer2memref"(%arg5) : (!llvm.ptr) -> memref
%66 = memref.load %65[%62] {alias_scopes = [#alias_scope2], alignment = 8 : i64, noalias_scopes = [#alias_scope, #alias_scope1, #alias_scope3, #alias_scope4, #alias_scope5], ordering = 0 : i64, tbaa = [#tbaa_tag1]} : memref
%67 = arith.cmpf une, %66, %cst_0 {fastmathFlags = #llvm.fastmath} : f64
%68 = math.absf %66 : f64
%69 = arith.addf %68, %cst {fastmathFlags = #llvm.fastmath} : f64
%70 = arith.divf %arg2, %69 {fastmathFlags = #llvm.fastmath} : f64
%71 = arith.cmpf ogt, %arg14, %70 {fastmathFlags = #llvm.fastmath} : f64
%72 = arith.select %71, %70, %arg14 {fastmathFlags = #llvm.fastmath} : f64
%73 = arith.select %67, %72, %arg14 : f64
%74 = arith.cmpf olt, %73, %arg12 {fastmathFlags = #llvm.fastmath} : f64
%75 = arith.select %74, %73, %arg12 {fastmathFlags = #llvm.fastmath} : f64
%76 = "enzymexla.pointer2memref"(%arg4) : (!llvm.ptr) -> memref
%77 = memref.load %76[%63] {alias_scopes = [#alias_scope1], alignment = 8 : i64, noalias_scopes = [#alias_scope, #alias_scope2, #alias_scope3, #alias_scope4, #alias_scope5], ordering = 0 : i64, tbaa = [#tbaa_tag1]} : memref
%78 = "enzymexla.pointer2memref"(%arg6) : (!llvm.ptr) -> memref
%79 = memref.load %78[%64] {alias_scopes = [#alias_scope3], alignment = 8 : i64, noalias_scopes = [#alias_scope, #alias_scope1, #alias_scope2, #alias_scope4, #alias_scope5], ordering = 0 : i64, tbaa = [#tbaa_tag1]} : memref
%80 = arith.mulf %77, %77 {fastmathFlags = #llvm.fastmath} : f64
%81 = arith.cmpf olt, %66, %cst_0 {fastmathFlags = #llvm.fastmath} : f64
%82 = arith.mulf %arg1, %79 {fastmathFlags = #llvm.fastmath} : f64
%83 = arith.mulf %79, %82 {fastmathFlags = #llvm.fastmath} : f64
%84 = arith.mulf %66, %83 {fastmathFlags = #llvm.fastmath} : f64
%85 = arith.mulf %66, %84 {fastmathFlags = #llvm.fastmath} : f64
%86 = arith.select %81, %85, %cst_0 {fastmathFlags = #llvm.fastmath} : f64
%87 = arith.addf %80, %86 {fastmathFlags = #llvm.fastmath} : f64
%88 = math.sqrt %87 : f64
%89 = arith.divf %79, %88 {fastmathFlags = #llvm.fastmath} : f64
%90 = arith.cmpf olt, %89, %arg15 {fastmathFlags = #llvm.fastmath} : f64
%91 = arith.andi %67, %90 : i1
%92 = arith.select %91, %89, %arg15 {fastmathFlags = #llvm.fastmath} : f64
%93 = arith.cmpf olt, %92, %arg13 {fastmathFlags = #llvm.fastmath} : f64
%94 = arith.select %93, %92, %arg13 {fastmathFlags = #llvm.fastmath} : f64
%95 = arith.cmpi slt, %arg11, %arg0 : i32
scf.condition(%95) %arg11, %75, %94, %73, %92 : i32, f64, f64, f64, f64
} do {
^bb0(%arg11: i32, %arg12: f64, %arg13: f64, %arg14: f64, %arg15: f64):
%58 = arith.addi %arg11, %55 : i32
scf.yield %58, %arg12, %arg13, %arg14, %arg15 : i32, f64, f64, f64, f64
}
scf.yield %57#2, %57#1 : f64, f64
} else {
scf.yield %cst_1, %cst_1 : f64, f64
}
%45 = "enzymexla.pointer2memref"(%0) : (!llvm.ptr<3>) -> memref
affine.store %44#1, %45[symbol(%34)] {alignment = 8 : i64, noalias_scopes = [#alias_scope, #alias_scope1, #alias_scope2, #alias_scope3, #alias_scope4, #alias_scope5], ordering = 0 : i64, tbaa = [#tbaa_tag1]} : memref
%46 = "enzymexla.pointer2memref"(%1) : (!llvm.ptr<3>) -> memref
affine.store %44#0, %46[symbol(%33)] {alignment = 8 : i64, noalias_scopes = [#alias_scope, #alias_scope1, #alias_scope2, #alias_scope3, #alias_scope4, #alias_scope5], ordering = 0 : i64, tbaa = [#tbaa_tag1]} : memref
llvm.return
}
}
```

Start by locating the DoWhile and while2for conversion entry points in the repository, then use the supplied MLIR module as a reproducer. Done means while2for handles blocks in the then region; the issue names no source file or test, so identify the relevant test location before making changes.

Written by the indexing model from the issue text.