fixup! Switch to checking EvaluationContext

Author: zyn0217

clang/lib/Sema/SemaTemplateInstantiateDecl.cpp

@@ -5836,11 +5836,16 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
   // With CWG2369, we substitute constraints before instantiating the associated
   // function template. This helps prevent potential code generation for
   // dependent types, particularly under the MS ABI.
-  bool InUnevaluatedOrImmediateContext =
-      llvm::any_of(ExprEvalContexts, [](auto &Context) {
-        return Context.isUnevaluated() || Context.isImmediateFunctionContext();
-      });
-  if (!InUnevaluatedOrImmediateContext) {
+  bool ShouldSkipCG = [&] {
+    auto *RD = dyn_cast<CXXRecordDecl>(Function->getParent());
+    if (!RD || !RD->isLambda())
+      return false;
+
+    return llvm::any_of(ExprEvalContexts, [](auto &Context) {
+      return Context.isUnevaluated() || Context.isImmediateFunctionContext();
+    });
+  }();
+  if (ShouldSkipCG) {
     DeclGroupRef DG(Function);
     Consumer.HandleTopLevelDecl(DG);
   }