[clang] [llvm] [PowerPC] Diagnose musttail instead of crash inside backend (PR #93267)

[Chen Zheng via llvm-commits]

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@@ -3833,6 +3833,11 @@ def note_cannot_use_trivial_abi_reason : Note<
   "it is polymorphic|"
   "it has a base of a non-trivial class type|it has a virtual base|"
   "it has a __weak field|it has a field of a non-trivial class type}1">;
+def warn_ppc_musttail_maybe_ignored: Warning<
+  "'musttail' attribute may be ignored on ppc targets">,
+  InGroup<IgnoredAttributes>;
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chenzheng1030 wrote:

Thank you for giving a look. Will update.

https://github.com/llvm/llvm-project/pull/93267