[clang] [Clang][Sema] fix crash in codegen stage when an lambda expression declared in an unevaluated context (PR #80802)

[Erich Keane via cfe-commits]

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@@ -1614,7 +1614,19 @@ bool TemplateInstantiator::AlreadyTransformed(QualType T) {
   if (T.isNull())
     return true;
 
-  if (T->isInstantiationDependentType() || T->isVariablyModifiedType())
+  bool DependentLambdaType = false;
+  QualType DesugaredType = T.getDesugaredType(SemaRef.getASTContext());
+  CXXRecordDecl *RD = DesugaredType->getAsCXXRecordDecl();
+  if (RD && RD->isLambda()) {
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erichkeane wrote:

`if (auto *RD = T->getAsCXXRecordDecl(); RD && RD->isLambda())`

??

https://github.com/llvm/llvm-project/pull/80802