[llvm-branch-commits] [llvm] Add initial support for SPE brstack format (PR #129231)

[Paschalis Mpeis via llvm-branch-commits]

https://github.com/paschalis-mpeis commented:

Thanks a lot for your work Adam!
I commented on some changes and nits.

Also noting that for now this PR is stacked on top of #120741.

https://github.com/llvm/llvm-project/pull/129231