Fix another uninitialized bool member bug found by -fsanitize=bool. This one

appears to currently be benign (we happen to test the flags in the right
order, so we never depend on the uninitialized value).

llvm-svn: 170640

clang/lib/AST/ASTDiagnostic.cpp

@@ -447,6 +447,7 @@ class TemplateDiff {
       DiffNode(unsigned ParentNode = 0)
         : NextNode(0), ChildNode(0), ParentNode(ParentNode),
           FromType(), ToType(), FromExpr(0), ToExpr(0), FromTD(0), ToTD(0),
+          IsValidFromInt(false), IsValidToInt(false),
           FromDefault(false), ToDefault(false), Same(false) { }
     };