[llvm] [BOLT][RISCV] Handle CIE's produced by GNU as (PR #69578)

[Rafael Auler via llvm-commits]

rafaelauler wrote:

> While technically correct, it would probably be better to replace the GNU CIE with the one used by LLVM to avoid this situation. 

I think the extra CFI being inserted is a small price to pay for compatibility with GNU binaries. I wouldn't worry about it.

https://github.com/llvm/llvm-project/pull/69578