Rework the core of class parsing/runtime semantic (#3598)

Changes:
 - Use the pre-scanner to provide information for the parser about the existence of the class constructor
 - The allocation of the super declarative environment is no longer needed
 - The VM frame context holds the information about the this binding status
 - Reduce the number of class related VM/CBC instructions
 - Improve ecma_op_function_{construct, call} to properly set new.target

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

tests/jerry/es2015/class-inheritance-has-instance.js

@@ -35,7 +35,7 @@ assert (secretArray instanceof Array);
 assert (!([] instanceof mySecretArray));
 
 /* Add a new element to the bound function chain */
-class myEpicSecretArray extends myArray { };
+class myEpicSecretArray extends mySecretArray { };
 
 var epicSecretArray = new myEpicSecretArray (1, 2, 3);
 epicSecretArray.push (4);