[llvm] [MISched][RISCV] Add anti-dependency breaking to PostMachineScheduler (PR #221984)

[via llvm-commits]

github-actions[bot] wrote:

test-suite diff from 0c62d834abff9b180def1b32d3cf9c225d504994...936399527ee239634be0621f66e6afbd29f58aa1: https://github.com/llvm/llvm-project/actions/runs/34335579622/artifacts/10101282086

Statistics: https://github.com/llvm/llvm-project/actions/runs/34335579622/artifacts/10101282864

## 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/221984