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

[Stephen Tozer via llvm-commits]

SLTozer wrote:

> 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 think it's probably a good idea to follow the original suggestion and just relax the verifier check - the rest of the changes in this patch are still useful, and if a store intrinsic wants to be handled more correctly when it's _untagged_ then it should be handled in `getUnknownStore`, but I don't think I'm in a position to add that for all possible store intrinsics.

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