[llvm] [xray] Do not emit tail exit hooks for conditional tail calls (PR #89364)

[Todd Lipcon via llvm-commits]

toddlipcon wrote:

If the tail call has no instrumentation at all, doesn't the xray-tracked stack end up messed up? ie we think the tail call is nested inside the main call instead of being a sibling, and then potentially never trace an exit for the main call?

https://github.com/llvm/llvm-project/pull/89364