89f8ba2855
This adds proper support for calling intrinsics without mangling suffix when parsing textual IR. This already worked (mostly by accident) when only a single mangling suffix was in use. This patch extends support to the case where the intrinsic is used with multiple signatures, and as such multiple different intrinsic declarations have to be inserted. The final IR will have intrinsics with mangling suffix as usual. Motivated by the discussion at: https://discourse.llvm.org/t/recent-improvements-to-the-ir-parser/77366