[llvm] [RFC][RISCV] Set enableSpillageCopyElimination (PR #132035)

[Philip Reames via llvm-commits]

preames wrote:

Glancing at the code, I see no obvious reason we can't turn this on.  As noted, we'd need to check compile time, and perf impact, but I don't see any blockers beyond that.

It's a slightly weird pattern to see in code, but if we're seeing it, and you seem to be saying we are, why not?

https://github.com/llvm/llvm-project/pull/132035