[AST][NFC] Pack CXXScalarValueInitExpr

Use the newly available space in the bit-fields of Stmt.
This saves one pointer per CXXScalarValueInitExpr. NFC.

llvm-svn: 350635
diff --git a/clang/lib/AST/ExprCXX.cpp b/clang/lib/AST/ExprCXX.cpp
index e336fdd..9a724cd 100644
--- a/clang/lib/AST/ExprCXX.cpp
+++ b/clang/lib/AST/ExprCXX.cpp
@@ -90,7 +90,7 @@
 
 // CXXScalarValueInitExpr
 SourceLocation CXXScalarValueInitExpr::getBeginLoc() const {
-  return TypeInfo ? TypeInfo->getTypeLoc().getBeginLoc() : RParenLoc;
+  return TypeInfo ? TypeInfo->getTypeLoc().getBeginLoc() : getRParenLoc();
 }
 
 // CXXNewExpr