[clang] Fix typos in member initializers

This was regressed in ca61961380. As we
attached InitExprs as-is to the AST, without performing transformations.

Differential Revision: https://reviews.llvm.org/D142187

clang/lib/Sema/SemaDeclCXX.cpp

@@ -4098,9 +4098,11 @@ void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D,
     return;
   }
 
-  ExprResult Init = InitExpr;
-  if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) {
-    Init = ConvertMemberDefaultInitExpression(FD, InitExpr, InitLoc);
+  ExprResult Init = CorrectDelayedTyposInExpr(InitExpr, /*InitDecl=*/nullptr,
+                                              /*RecoverUncorrectedTypos=*/true);
+  assert(Init.isUsable() && "Init should at least have a RecoveryExpr");
+  if (!FD->getType()->isDependentType() && !Init.get()->isTypeDependent()) {
+    Init = ConvertMemberDefaultInitExpression(FD, Init.get(), InitLoc);
     // C++11 [class.base.init]p7:
     //   The initialization of each base and member constitutes a
     //   full-expression.
@@ -4112,9 +4114,7 @@ void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D,
     }
   }
 
-  InitExpr = Init.get();
-
-  FD->setInClassInitializer(InitExpr);
+  FD->setInClassInitializer(Init.get());
 }
 
 /// Find the direct and/or virtual base specifiers that

clang/test/PCH/typo3.cpp

@@ -0,0 +1,8 @@
+// RUN: not %clang_cc1 -emit-pch %s -o %t.pch 2>&1 | FileCheck %s
+
+struct S {
+  // Make sure TypoExprs in default init exprs are corrected before serializing
+  // in PCH.
+  int y = bar;
+  // CHECK: use of undeclared identifier 'bar'
+};