[llvm] [LAA] Prepare to handle diff type sizes (NFC) (PR #122318)

[via llvm-commits]

KennethHilmersson wrote:

Attaching debug printouts when compiling with the patch and with the patch reverted. Note again it is from the previous godbolt example with -O3 -fno-strict-aliasing for both cases now for our out of tree target (byte size 16 bits and big-endian).
[reverted-laa-nfc-patch.log](https://github.com/user-attachments/files/22519903/reverted-laa-nfc-patch.log)
[laa-nfc-patch.log](https://github.com/user-attachments/files/22519904/laa-nfc-patch.log)


https://github.com/llvm/llvm-project/pull/122318