[llvm] MCExpr-ify SIProgramInfo (PR #88257)

[Thurston Dang via llvm-commits]

thurstond wrote:

> > > I think this may have broken a buildbot:
> > > https://lab.llvm.org/buildbot/#/builders/5/builds/43260/steps/9/logs/stdio
> > > ```
> > >   LLVM-Unit :: MC/AMDGPU/./AMDGPUMCTests/SIProgramInfoMCExprsTest/TestDeathHSAKernelEmit
> > > 
> > > [  DEATH   ] /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp:464:38: runtime error: reference binding to null pointer of type 'const llvm::SIMachineFunctionInfo'
> > > ```
> > 
> > 
> > As the buildbots have been broken for a day now, could you please consider reverting to green if a fix-forward is not landing soon?
> 
> I believe I have a fix ready soon, apologies that it is taking a bit.

Thank you!

https://github.com/llvm/llvm-project/pull/88257