[llvm] [DXIL][Analysis] Implement enough of DXILResourceAnalysis for buffers (PR #100699)

[Amy Kwan via llvm-commits]

amy-kwan wrote:

I think this patch is causing issues on two PPC bots:
https://lab.llvm.org/buildbot/#/builders/95/builds/2574/steps/5/logs/stdio
https://lab.llvm.org/buildbot/#/builders/76/builds/1939/steps/4/logs/stdio

Could you please investigate/revert this if a quick fix is not possible?

https://github.com/llvm/llvm-project/pull/100699