[clang] [llvm] [LTO][AllocToken] Support AllocToken instrumentation in backend (PR #169358)

[Teresa Johnson via llvm-commits]

teresajohnson wrote:

> > Also, please add a change to an existing memprof test like suggested above - this will ensure the phase ordering stays correct.
> 
> Sorry, missed that. Added 2 new tests - it seems that we need -supports-hot-cold-new and the index so the LTO pipeline doesn't remove the hot/cold hints, correct? I added a dedicated test to the AllocToken suite and another in the LTO/X86 suite, the latter of which should ensure we catch any deeper regressions.

Ah, that is a complication, I should put that pass under an internal option so it could be disabled for testing, but what you did here lgtm.


https://github.com/llvm/llvm-project/pull/169358