[clang] [Clang][LoongArch] Support builtin functions for LSX and LASX (PR #69313)

[Lu Weining via cfe-commits]

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

- For the commits `[LoongArch][CodeGen][clang] Add builtin functions test cases for LASX` and `[LoongArch][CodeGen][clang] Add builtin functions test cases for LSX`, `Change-Id`s can be removed.
- Please fix the test failure.

https://github.com/llvm/llvm-project/pull/69313