Fixes declarationStatement issue

It was not parsing the following correctly:

int f()
{
    MyClass *test= new MyClass;
    test->foo();
}

MyClass *test was being interpreted as an expression (multiplicativeExpression) instead of a declarationStatement.

cpp/CPP14Parser.g4

@@ -225,15 +225,15 @@ constantExpression: conditionalExpression;
 
 statement:
 	labeledStatement
+	| declarationStatement
 	| attributeSpecifierSeq? (
 		expressionStatement
 		| compoundStatement
 		| selectionStatement
 		| iterationStatement
 		| jumpStatement
 		| tryBlock
-	)
-	| declarationStatement;
+	);
 
 labeledStatement:
 	attributeSpecifierSeq? (