[clang] [clang] Support -Wa, options -mmsa and -mno-msa (PR #99615)

[YunQiang Su via cfe-commits]

wzssyqa wrote:

I have a try of your patch
```
$ ./bin/clang --target=mips-linux-gnu -mfp64 -Wa,-mmsa nn.c
error: unknown argument: '-mmsa'
```

```
 mipsel-linux-gnu-gcc-14 -mfp64 -Wa,-mmsa nn.c
```
has no such problem.

https://github.com/llvm/llvm-project/pull/99615