[llvm] [SelectionDAG] Fold constant min/max vector reductions (PR #209190)

[via llvm-commits]

github-actions[bot] wrote:

test-suite diff from e2c8fa09872cfacba7f73599dcf8557971ebe865...c147ea3800dbc5e6353f189e9e98374c48103821: https://github.com/llvm/llvm-project/actions/runs/29307584230/artifacts/8301934110

Statistics: https://github.com/llvm/llvm-project/actions/runs/29307584230/artifacts/8301934533

## 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/209190