[clang] [llvm] [CodeGenPrepare] Failure to hoist bitcast to legal type causes register splitting (PR #207568)

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github-actions[bot] wrote:

test-suite diff from 33d2c6ad8c342d40aa443afb7dd03ad0af0e103c...52902f8132a6b294d805474c9ad7646a3a3a559e: https://github.com/llvm/llvm-project/actions/runs/30421935935/artifacts/8713728617

Statistics: https://github.com/llvm/llvm-project/actions/runs/30421935935/artifacts/8713729068

## 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/207568