[clang] Disable constexpr function body checking in more situations (PR #94347)

[Erich Keane via cfe-commits]

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@@ -961,6 +961,10 @@ def Wdeprecated : Flag<["-"], "Wdeprecated">, Group<W_Group>,
   HelpText<"Enable warnings for deprecated constructs and define __DEPRECATED">;
 def Wno_deprecated : Flag<["-"], "Wno-deprecated">, Group<W_Group>,
   Visibility<[ClangOption, CC1Option]>;
+def Winvalid_constexpr : Flag<["-"], "Winvalid-constexpr">, Group<W_Group>,
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erichkeane wrote:

I don't think we want these to be separate.  There is a variety of 'Flags' somewhere that auto generates both.

https://github.com/llvm/llvm-project/pull/94347