[clang] [compiler-rt] [XRay] Add support for instrumentation of DSOs on x86_64 (PR #90959)

[Sebastian Kreutzer via cfe-commits]

sebastiankreutzer wrote:

@androm3da @MaskRay 
I'm tagging you because I'm having trouble to get feedback to this PR, and you seem to be the most recent contributors to XRay.
Would one of you be willing to review it? 
Any other pointers on who to get in touch with are also much appreciated. 

https://github.com/llvm/llvm-project/pull/90959