[clang] [Clang][WIP] Constant Expressions inside of gcc'asm strings (PR #131003)

[via cfe-commits]

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@@ -15328,6 +15338,15 @@ void Sema::PragmaStack<Sema::AlignPackInfo>::Act(SourceLocation PragmaLocation,
                                                  PragmaMsStackAction Action,
                                                  llvm::StringRef StackSlotLabel,
                                                  AlignPackInfo Value);
+
+inline
+const StreamingDiagnostic &operator<<(const StreamingDiagnostic &DB,
+                                    Sema::StringEvaluationContext Ctx) {
+  DB << llvm::to_underlying(Ctx);
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cor3ntin wrote:

As discussed offline, this is just to pass a number for `%select{}`

https://github.com/llvm/llvm-project/pull/131003