[llvm] [Mips] Fix clang integrated assembler generates incorrect relocations… (PR #83115)

[Fangrui Song via llvm-commits]

https://github.com/MaskRay requested changes to this pull request.

I don't have more time spent on investigating the issue, but adding a lot of mips-specific code to the generic AsmParser.cpp is not acceptable.

https://github.com/llvm/llvm-project/pull/83115