[mlir](test-vector-unrolling-patterns) mlir-opt crashes at SmallVector.h:300 with assertion `idx < size()' failed.

git version: 40cddd81aa9d508beb3b9cfa7fb37a168bfea593

MLIR Program:
```mlir
module {
func.func private @m(%arg0: index, %arg1: vector<8x8x16xi4>, %arg2: vector<16xi1>, %arg3: memref<512xi8>, %arg4: vector<8xi8>) -> vector<8x8x16xi4> {
%c8 = arith.constant 8 : index
%cst_0 = arith.constant dense<0> : vector<16xi4>
%17 = vector.create_mask %c8, %arg0, %c8 : vector<8x8x8xi1>
%19 = vector.extract %17[0, 0] : vector<8xi1> from vector<8x8x8xi1>
%20 = vector.bitcast %cst_0 : vector<16xi4> to vector<8xi8>
%c0 = arith.constant 0 : index
%21 = vector.maskedload %arg3[%c0], %19, %arg4 : memref<512xi8>, vector<8xi1>, vector<8xi8> into vector<8xi8>
%22 = vector.bitcast %21 : vector<8xi8> to vector<16xi4>
%23 = arith.select %arg2, %22, %cst_0 : vector<16xi1>, vector<16xi4>
%24 = vector.insert %23, %arg1 [0, 0] : vector<16xi4> into vector<8x8x16xi4>
return %24 : vector<8x8x16xi4>
}
}
```

Reproduce Command: `mlir-opt -test-vector-unrolling-patterns a.mlir`

StackTrace:
```
mlir-opt: /data2/dependency/dev/llvm-project/llvm/include/llvm/ADT/SmallVector.h:300: T& llvm::SmallVectorTemplateCommon >::operator[](llvm::SmallVectorTemplateCommon >::size_type) [with T = long int; = void; llvm::SmallVectorTemplateCommon >::reference = long int&; llvm::SmallVectorTemplateCommon >::size_type = long unsigned int]: Assertion `idx < size()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: mlir-opt -test-vector-unrolling-patterns a.mlir
#0 0x00005638a702f7bf llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0x20367bf)
#1 0x00005638a702bf5c llvm::sys::RunSignalHandlers() (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0x2032f5c)
#2 0x00005638a702c103 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x00007f8461525420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#4 0x00007f846101000b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
#5 0x00007f8460fef859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
#6 0x00007f8460fef729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
#7 0x00007f8461000fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
#8 0x00005638ae28e022 (anonymous namespace)::UnrollCreateMaskPattern::matchAndRewrite(mlir::vector::CreateMaskOp, mlir::PatternRewriter&) const VectorUnroll.cpp:0:0
#9 0x00005638ae1d7330 mlir::detail::OpOrInterfaceRewritePatternBase::matchAndRewrite(mlir::Operation*, mlir::PatternRewriter&) const (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0x91de330)
#10 0x00005638b0200142 mlir::PatternApplicator::matchAndRewrite(mlir::Operation*, mlir::PatternRewriter&, llvm::function_ref, llvm::function_ref, llvm::function_ref)::'lambda'()::operator()() const PatternApplicator.cpp:0:0
#11 0x00005638b02016a8 mlir::PatternApplicator::matchAndRewrite(mlir::Operation*, mlir::PatternRewriter&, llvm::function_ref, llvm::function_ref, llvm::function_ref) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb2086a8)
#12 0x00005638b01cb237 (anonymous namespace)::GreedyPatternRewriteDriver::processWorklist() GreedyPatternRewriteDriver.cpp:0:0
#13 0x00005638b01cf4f6 mlir::applyPatternsGreedily(mlir::Region&, mlir::FrozenRewritePatternSet const&, mlir::GreedyRewriteConfig, bool*) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb1d64f6)
#14 0x00005638a7967c22 mlir::applyPatternsGreedily(mlir::Operation*, mlir::FrozenRewritePatternSet const&, mlir::GreedyRewriteConfig, bool*) (.constprop.0) TestVectorTransforms.cpp:0:0
#15 0x00005638a7974a01 (anonymous namespace)::TestVectorUnrollingPatterns::runOnOperation() TestVectorTransforms.cpp:0:0
#16 0x00005638b026bce1 mlir::detail::OpToOpPassAdaptor::run(mlir::Pass*, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb272ce1)
#17 0x00005638b026c070 mlir::detail::OpToOpPassAdaptor::runPipeline(mlir::OpPassManager&, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int, mlir::PassInstrumentor*, mlir::PassInstrumentation::PipelineParentInfo const*) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb273070)
#18 0x00005638b026c94e mlir::detail::OpToOpPassAdaptor::runOnOperationAsyncImpl(bool)::'lambda12'(mlir::detail::OpToOpPassAdaptor::runOnOperationAsyncImpl(bool)::OpPMInfo&)::operator()(mlir::detail::OpToOpPassAdaptor::runOnOperationAsyncImpl(bool)::OpPMInfo&) const Pass.cpp:0:0
#19 0x00005638b026acdd mlir::detail::OpToOpPassAdaptor::runOnOperationAsyncImpl(bool) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb271cdd)
#20 0x00005638b026bbbb mlir::detail::OpToOpPassAdaptor::run(mlir::Pass*, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb272bbb)
#21 0x00005638b026c070 mlir::detail::OpToOpPassAdaptor::runPipeline(mlir::OpPassManager&, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int, mlir::PassInstrumentor*, mlir::PassInstrumentation::PipelineParentInfo const*) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb273070)
#22 0x00005638b026e124 mlir::PassManager::runPasses(mlir::Operation*, mlir::AnalysisManager) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb275124)
#23 0x00005638b026f1a1 mlir::PassManager::run(mlir::Operation*) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb2761a1)
#24 0x00005638a70f5d2b performActions(llvm::raw_ostream&, std::shared_ptr const&, mlir::MLIRContext*, mlir::MlirOptMainConfig const&) MlirOptMain.cpp:0:0
#25 0x00005638a70f686f processBuffer(llvm::raw_ostream&, std::unique_ptr>, llvm::MemoryBufferRef, mlir::MlirOptMainConfig const&, mlir::DialectRegistry&, mlir::SourceMgrDiagnosticVerifierHandler*, llvm::ThreadPoolInterface*) MlirOptMain.cpp:0:0
#26 0x00005638a70f6a9b llvm::LogicalResult llvm::function_ref>, llvm::MemoryBufferRef const&, llvm::raw_ostream&)>::callback_fn>, mlir::DialectRegistry&, mlir::MlirOptMainConfig const&)::'lambda'(std::unique_ptr>, llvm::MemoryBufferRef, llvm::raw_ostream&)>(long, std::unique_ptr>, llvm::MemoryBufferRef const&, llvm::raw_ostream&) MlirOptMain.cpp:0:0
#27 0x00005638b063f725 mlir::splitAndProcessBuffer(std::unique_ptr>, llvm::function_ref>, llvm::MemoryBufferRef const&, llvm::raw_ostream&)>, llvm::raw_ostream&, llvm::StringRef, llvm::StringRef) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0xb646725)
#28 0x00005638a70ecae4 mlir::MlirOptMain(llvm::raw_ostream&, std::unique_ptr>, mlir::DialectRegistry&, mlir::MlirOptMainConfig const&) (.part.0) MlirOptMain.cpp:0:0
#29 0x00005638a70f6fb7 mlir::MlirOptMain(int, char**, llvm::StringRef, llvm::StringRef, mlir::DialectRegistry&) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0x20fdfb7)
#30 0x00005638a70f71f3 mlir::MlirOptMain(int, char**, llvm::StringRef, mlir::DialectRegistry&) (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0x20fe1f3)
#31 0x00005638a6f73cf7 main (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0x1f7acf7)
#32 0x00007f8460ff1083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#33 0x00005638a700bd8e _start (/data2/dependency/dev/llvm-project/build/bin/mlir-opt+0x2012d8e)
Aborted (core dumped)
```

Reproduce the crash with mlir-opt -test-vector-unrolling-patterns a.mlir, then inspect UnrollCreateMaskPattern::matchAndRewrite in VectorUnroll.cpp and the pass in TestVectorTransforms.cpp. Add a regression test using the supplied MLIR program and verify that the command no longer aborts.

Written by the indexing model from the issue text.