[llvm] [VPlan] Introduce distillation of widening semantics (NFC) (PR #196181)

[via llvm-commits]

github-actions[bot] wrote:

test-suite diff from 717615829bba4035897a4ebdbdef919f31529762...60ab0106b64181ef969aed09fb21ec7dca42e2c5: https://github.com/llvm/llvm-project/actions/runs/29243776818/artifacts/8278399309

Statistics: https://github.com/llvm/llvm-project/actions/runs/29243776818/artifacts/8278399705

## 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/196181