llvm-project

a4dec9d6 - [CodeGen] Fix register pressure computation in MachinePipeliner (#87030)

[CodeGen] Fix register pressure computation in MachinePipeliner (#87030) `RegisterClassInfo::getRegPressureSetLimit` has been changed to return a smaller value than before so the limit may become negative in later calculations. As a workaround, change to use `TargetRegisterInfo::getRegPressureSetLimit`. Also improve tests.