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

[via cfe-commits]

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@@ -2507,6 +2507,7 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
   bool Crel = false, ExperimentalCrel = false;
   bool UseRelaxRelocations = C.getDefaultToolChain().useRelaxRelocations();
   bool UseNoExecStack = false;
+  bool Msa = false;
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yingopq wrote:

> `std::optional<bool> Msa`. `-mno-msa` should lead to an error even on non-mips targets.
What error need I add in this https://github.com/llvm/llvm-project/commit/444cd83d070600a26938514070d79dc900946868, and what is *Msa?


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