[clang] [llvm] [InstCombine] Combine ((ext(A) * ext(B)) >> N) -> ext(mulh(A, B)). (PR #224311)

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github-actions[bot] wrote:

test-suite diff from 3dcd66d0110335d7d1a5921fd085914b66ffbd3c...22f265b3982c97c9911a629ed424fae38fa2f39b: https://github.com/llvm/llvm-project/actions/runs/35434215803/artifacts/10581389831

Statistics: https://github.com/llvm/llvm-project/actions/runs/35434215803/artifacts/10581309879

## 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/224311