[llvm] [RISCV] Add an option to enable CFIInstrInserter. (PR #164477)

[Sam Elliott via llvm-commits]

lenary wrote:

I'm not actually sure the value of that test. What I'm trying to get an answer to is "why is this pass being added?", but I also haven't had the time to go and review what CFIInserter does and why - I know it's (by LLVM's standards) a fairly recent addition. (Your test shows CFI Inserter is being added, but not what effect that has, just the debug output from it being added)

If there are no (CodeGen) changes to existing tests, then I guess there's no problem and we can proceed, especially if it unblocks things we know are improvements.

https://github.com/llvm/llvm-project/pull/164477