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

[Shilei Tian via llvm-commits]

================
@@ -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;
----------------
shiltian wrote:

Oh, I missed that part. Hardcoding 8 is probably fine for now and in the near future, but the proper approach is definitely to query DL.

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