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

[Mikhail Gudim via llvm-commits]

mgudim wrote:

> @mgudim -- we are seeing the test failures on build bot `CodeGen/RISCV/cfi-multiple-locations.mir` in our toolchain builders at Google as well https://luci-milo.appspot.com/ui/p/fuchsia/builders/prod/clang-linux-arm64/b8697867649418140369/overview
> 
> Can you please fix or revert?

@Prabhuk sorry about breaking the build. Here's a fix: https://github.com/llvm/llvm-project/pull/168525 . If you review it, I'll merge it. Or you can merge it too

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