[llvm] [VPlan] Compute scalar cost based on VPlan0 instead of legacy CM. (PR #196845)

[via llvm-commits]

github-actions[bot] wrote:

test-suite diff from 5c0b781b08ac55ceb4432631add3f8965146ae86...dda81fac53e4b75a3e413ad73173e49fe2ceac84: https://github.com/llvm/llvm-project/actions/runs/35579040107/artifacts/10632945778

Statistics: https://github.com/llvm/llvm-project/actions/runs/35579040107/artifacts/10632281756

## riscv64-linux-gnu `-march=rva23u64 -O3`
| ('Program', '')                             |   ('size..text', 'base') |   ('size..text', 'head') |   ('size..text', 'diff') |
|:--------------------------------------------|-------------------------:|-------------------------:|-------------------------:|
| test-suite...nchmarks/McCat/18-imp/imp.test |                     9766 |                    10334 |              0.058161    |
| Geomean difference                          |                      nan |                      nan |              0.000175909 |
## aarch64-linux-gnu `-march=armv9-a -O3`
| ('Program', '')                             |   ('size..text', 'base') |   ('size..text', 'head') |   ('size..text', 'diff') |
|:--------------------------------------------|-------------------------:|-------------------------:|-------------------------:|
| test-suite...nchmarks/McCat/18-imp/imp.test |                    11836 |                    12652 |              0.0689422   |
| Geomean difference                          |                      nan |                      nan |              0.000118579 |
## x86_64-linux-gnu `-march=x86-64-v3 -O3`
| ('Program', '')                             |   ('size..text', 'base') |   ('size..text', 'head') |   ('size..text', 'diff') |
|:--------------------------------------------|-------------------------:|-------------------------:|-------------------------:|
| MiBench/au...omotive-susan/automotive-susan |                    30699 |                    31403 |              0.0229323   |
| Bullet/bullet                               |                   724622 |                   724702 |              0.000110402 |
| Geomean difference                          |                      nan |                      nan |              7.03227e-05 |


https://github.com/llvm/llvm-project/pull/196845