[llvm] [VPlan] Generalize usesScalars using WideInfo (NFCI) (PR #208910)

[via llvm-commits]

github-actions[bot] wrote:

test-suite diff from 2de67c330a9739e559f88de9874d4cba3ffc50ca...a79223cbdf660a06c315861c6efec45c32fee11e: https://github.com/llvm/llvm-project/actions/runs/29243262918/artifacts/8278175668

Statistics: https://github.com/llvm/llvm-project/actions/runs/29243262918/artifacts/8278175937

## 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/208910