default initialize field

Signed-off-by: Justin Stitt <[email protected]>

Author: JustinStitt

clang/include/clang/AST/Expr.h

@@ -3860,7 +3860,7 @@ class CStyleCastExpr final
 class BinaryOperator : public Expr {
   enum { LHS, RHS, END_EXPR };
   Stmt *SubExprs[END_EXPR];
-  bool ExcludedOverflowPattern;
+  bool ExcludedOverflowPattern = false;
 
 public:
   typedef BinaryOperatorKind Opcode;