[llvm] [DebugInfo] Handle additional types of stores in assignment tracking (PR #129070)

[Alex Bradbury via llvm-commits]

asb wrote:

I can confirm that with this patch applied. I can compile SPEC in the llvm-test-suite with `-g` and the vector extension. As commented inline, I think llvm.masked.compressstore is probably missed.

There's also the case of target-specific instrinsics, e.g. llvm.riscv.vse. These should only be produced by the C intrinsics and I guess don't currently have the metadata attached,  but I'm not sure there's a fundamental reason a frontend wouldn't attach DIAssignID metadata.

I don't feel well placed to review the whole PR, but with the query about llvm.masked.compressstore answered the verifier changes LGTM.

https://github.com/llvm/llvm-project/pull/129070