Implement var statement pre-scanning. (#3103)

The patch also checks whether pre-scanning is successful when scanning is,
so no need for explicit pre-scanner checks anymore.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/es2015/class.js

@@ -236,6 +236,3 @@ assert (G.get() == 11);
 assert (G.set() == 12);
 G.constructor = 30;
 assert (G.constructor === 30);
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/function-rest-parameter.js

@@ -78,6 +78,3 @@ assert (g2 () === 11);
 assert (g2 (1) === 3);
 assert (g2 (1, 2) === 3);
 assert (g2 (1, 2, 3) === 4);
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-export-01.js

@@ -39,6 +39,3 @@ assert (x === 42);
 assert (f(1) === 1);
 var dog = new Dog("Pluto")
 assert(dog.speak() === "Pluto barks.")
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-export-02.js

@@ -18,6 +18,3 @@ export {aa,} from "module-export-01.js";
 export {bb as b_, cc as c_} from "module-export-01.js";
 export * from "module-export-01.js";
 export default function () {return "default"};
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-export-03.js

@@ -24,6 +24,3 @@ export default class {
 }
 
 export * from "module-export-02.js"
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-export-04.js

@@ -15,6 +15,3 @@
 
 export var x = 41
 export default a = "str"
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-export-05.js

@@ -16,6 +16,3 @@
 export * from "module-export-01.js";
 export * from "module-export-04.js";
 export default a = "str"
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-export-06.js

@@ -17,6 +17,3 @@ export {}
 export {} from "module-export-01.js";
 export {};
 export {} from "module-export-04.js"
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-export-07.js

@@ -15,6 +15,3 @@
 
 var y, z;
 export default x = y = z = "default";
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-import-01.js

@@ -31,6 +31,3 @@ assert (mod.f("str") === "str")
 
 var dog = new mod.Dog("Oddie")
 assert (dog.speak() === "Oddie barks.")
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-import-02.js

@@ -22,6 +22,3 @@ assert (b_ === 5)
 assert (c_(b_) === 10)
 assert (mod.x === 42)
 assert (Array.isArray(mod.d))
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-import-03.js

@@ -22,6 +22,3 @@ assert(i.incr() === 6);
 assert (aa === "a");
 assert (x === 42);
 assert (c_(x) == 84);
-
-// Pre-scanner regression test
-for (var tmp in {}) ;

tests/jerry/es2015/module-import-04.js

@@ -17,6 +17,3 @@ import "module-import-01.js";
 import "module-export-05.js";
 import "module-export-06.js";
 import "module-export-07.js";
-
-// Pre-scanner regression test
-for (var tmp in {}) ;