[llvm] [RISCV] Enable -riscv-enable-sink-fold by default. (PR #82026)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Looks like this patch causes ~22.8% performance regression on `MultiSource/Benchmarks/MallocBench/gs/gs`, which is compiled with `-Os`.

See also https://github.com/dtcxzyw/llvm-ci/issues/1073 and https://github.com/dtcxzyw/llvm-ci/pull/1098.



https://github.com/llvm/llvm-project/pull/82026