[HLSL] DXILLegalizePass assertion failure on dynamically-indexed local resource arrays

When compiling HLSL shaders that copy global resource array elements into a local resource array and then dynamically index the local array, clang-dxc crashes during the DXIL Legalizer pass.

Reproducer:

```hlsl
RWByteAddressBuffer gBufArray[4] : register(u0);

[numthreads(1,1,1)]
void main(uint3 tid : SV_DispatchThreadID) {
RWByteAddressBuffer arr[2];
arr[0] = gBufArray[0];
arr[1] = gBufArray[1];
arr[tid.x & 1].Store(0, 42);
}
```

Command:

`clang-dxc -T cs_6_0 -Fo out.o source.hlsl`

Error and stack trace:
```
error: Load of "arrayidx4.i4" is not a global resource handle
Assertion failed: ArrayTy->getArrayElementType() == LoadStoreTy &&
"Expected array element type to be the same as to the scalar load or store type",
file llvm/lib/Target/DirectX/DXILLegalizePass.cpp, line 448

Stack dump:
0. Program arguments: clang-dxc -T cs_6_0 -Fo out.o source.hlsl
1. parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'source.hlsl'
4. Running pass 'DXIL Legalizer' on function '@main'

#0 HandleAbort (llvm/lib/Support/Windows/Signals.inc:371)
#1 ucrtbased.dll+0x99e77
#2 ucrtbased.dll+0x9bab9
#3 ucrtbased.dll+0xa141f
#4 ucrtbased.dll+0x9f351
#5 ucrtbased.dll+0xa1c7f
#6 legalizeScalarLoadStoreOnArrays (llvm/lib/Target/DirectX/DXILLegalizePass.cpp:450)
#7 std::invoke<...> (type_traits:1688)
#8 std::_Func_impl_no_alloc<...>::_Do_call (functional:885)
#9 std::_Func_class<...>::operator() (functional:930)
#10 DXILLegalizationPipeline::runLegalizationPipeline (llvm/lib/Target/DirectX/DXILLegalizePass.cpp:472)
#11 DXILLegalizeLegacy::runOnFunction (llvm/lib/Target/DirectX/DXILLegalizePass.cpp:529)
```

Impact: Local resource arrays with dynamic indexing (e.g., arr[tid.x & 1]) crash Clang's DXIL backend. Static indexing of local resource arrays works fine. The same shader compiles and runs correctly with DXC.