[llvm] [AMDGPU] Skip handling of non-byte types in promote alloca. (PR #128769)

[Sumanth Gundapaneni via llvm-commits]

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@@ -776,8 +784,7 @@ bool AMDGPUPromoteAllocaImpl::tryPromoteAllocaToVector(AllocaInst &Alloca) {
 
   LLVM_DEBUG(dbgs() << "  Attempting promotion to: " << *VectorTy << "\n");
 
-  Type *VecEltTy = VectorTy->getElementType();
-  unsigned ElementSize = DL->getTypeSizeInBits(VecEltTy) / 8;
+  unsigned ElementSize = ElementSizeInBits / SIZE_OF_BYTE;
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sgundapa wrote:

You mean , to use some thing like this  to derive the value from data layout  "DL.getTypeSizeInBits(Type::getInt8Ty(M->getContext()))". 

https://github.com/llvm/llvm-project/pull/128769