[clang] [clang][DebugInfo] Add inlined subprogram metadata for compiler built-ins (PR #189969)

[Shivam Kunwar via cfe-commits]

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@@ -2648,6 +2648,11 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
   assert(!getContext().BuiltinInfo.isImmediate(BuiltinID) &&
          "Should not codegen for consteval builtins");
 
+  // Treat built-in as call to artificial inlined function in debug info.
+  // This enables e.g. profiling tools to annotate time spent in user-called
+  // built-ins with the built-in function name.
+  ApplyBuiltinDebugLocation DebugScope(*this, GD);
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phyBrackets wrote:

I wonder if there is a way to scope this to built-in that actually expand to calls? Or at least skipping buit-ins that lower to single intrinsic with no side effects

https://github.com/llvm/llvm-project/pull/189969