[llvm] [LAA] Prepare to handle diff type sizes v2 (NFC) (PR #161238)

[via llvm-commits]

github-actions[bot] wrote:

test-suite diff from 13e9cc22ce4edfd4b1347d6bed9cd95868e2d4f4...70a6f3b56dbb7cc798c6474423342231aaf2979c: https://github.com/llvm/llvm-project/actions/runs/29251090637/artifacts/8281578351

Statistics: https://github.com/llvm/llvm-project/actions/runs/29251090637/artifacts/8281578827

## riscv64-linux-gnu `-march=rva23u64 -O3`
| ('Program', '')    |   ('size..text', 'base') |   ('size..text', 'head') |   ('size..text', 'diff') |
|:-------------------|-------------------------:|-------------------------:|-------------------------:|
| Geomean difference |                      nan |                      nan |                        0 |
## aarch64-linux-gnu `-march=armv9-a -O3`
| ('Program', '')    |   ('size..text', 'base') |   ('size..text', 'head') |   ('size..text', 'diff') |
|:-------------------|-------------------------:|-------------------------:|-------------------------:|
| Geomean difference |                      nan |                      nan |                        0 |
## x86_64-linux-gnu `-march=x86-64-v3 -O3`
| ('Program', '')    |   ('size..text', 'base') |   ('size..text', 'head') |   ('size..text', 'diff') |
|:-------------------|-------------------------:|-------------------------:|-------------------------:|
| Geomean difference |                      nan |                      nan |                        0 |


https://github.com/llvm/llvm-project/pull/161238