[clang] [llvm] demangle function names in trace files (PR #87626)

[Jamie Schmeiser via cfe-commits]

jamieschmeiser wrote:

@Trass3r, sorry, I didn't realize that you were waiting on me...  I had already approved this so you can go ahead and merge it.  I was just pointing you at possibly related work that might interest you.  Even if you decide to expand this work, I would suggest delivering this as is and doing that as a separate piece. 

https://github.com/llvm/llvm-project/pull/87626