[llvm] [RISCV] Fix type inference ambiguity in SwapSysReg pattern (PR #184305)

[Craig Topper via llvm-commits]

topperc wrote:

> I'm OK with this change, but we don't have this issue in upstream so can you explain the case where you met this problem?

The SwapSysReg is never instantiated. The SwapSysRegImm that is used already has the same fix.

https://github.com/llvm/llvm-project/pull/184305