[clang] [llvm] [CodeGen][LLVM] Make the `va_list` related intrinsics generic. (PR #85460)

[Yaxun Liu via cfe-commits]

yxsamliu wrote:

> Doesn’t AutoUpgrade automatically infer overloads? You can see a bunch of tests in this patch where the output references the overloaded intrinsics but the input is unchanged.

OK it seems to be handled already and test covered. Thanks.

https://github.com/llvm/llvm-project/pull/85460