Allow TransformTypos to ignore corrections to a specified VarDecl.

This is needed to prevent a TypoExpr from being corrected to a variable
when the TypoExpr is a subexpression of that variable's initializer.

Also exclude more keywords from the correction candidate pool when the
subsequent token is .* or ->* since keywords like "new" or "return"
aren't valid on the left side of those operators.

Fixes PR23140.

llvm-svn: 236519
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 00922f7..7f4b395 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -8710,7 +8710,7 @@
   // If there is no declaration, there was an error parsing it.  Just ignore
   // the initializer.
   if (!RealDecl || RealDecl->isInvalidDecl()) {
-    CorrectDelayedTyposInExpr(Init);
+    CorrectDelayedTyposInExpr(Init, dyn_cast_or_null<VarDecl>(RealDecl));
     return;
   }
 
@@ -8744,11 +8744,12 @@
     // Attempt typo correction early so that the type of the init expression can
     // be deduced based on the chosen correction:if the original init contains a
     // TypoExpr.
-    ExprResult Res = CorrectDelayedTyposInExpr(Init);
+    ExprResult Res = CorrectDelayedTyposInExpr(Init, VDecl);
     if (!Res.isUsable()) {
       RealDecl->setInvalidDecl();
       return;
     }
+
     if (Res.get() != Init) {
       Init = Res.get();
       if (CXXDirectInit)
@@ -8967,8 +8968,8 @@
 
     // Try to correct any TypoExprs in the initialization arguments.
     for (size_t Idx = 0; Idx < Args.size(); ++Idx) {
-      ExprResult Res =
-          CorrectDelayedTyposInExpr(Args[Idx], [this, Entity, Kind](Expr *E) {
+      ExprResult Res = CorrectDelayedTyposInExpr(
+          Args[Idx], VDecl, [this, Entity, Kind](Expr *E) {
             InitializationSequence Init(*this, Entity, Kind, MultiExprArg(E));
             return Init.Failed() ? ExprError() : E;
           });