Improve coverage

The modified tests are equally valid in strict mode and outside of
strict mode. Remove the flag which limits their use to only one of these
two contexts. Rename tests using the legacy ES5-based naming scheme to
remove the pattern which designates strict mode.

test/built-ins/Map/prototype/forEach/callback-result-is-abrupt.js

@@ -16,7 +16,6 @@ info: |
       i. Let funcResult be Call(callbackfn, T, «e.[[value]], e.[[key]], M»).
       ii. ReturnIfAbrupt(funcResult).
   ...
-flags: [noStrict]
 ---*/
 
 var map = new Map([[0, 0]]);

test/built-ins/global/10.2.1.1.3-4-22.js

@@ -4,10 +4,8 @@
 /*---
 es5id: 10.2.1.1.3-4-22-s
 description: >
-    Strict Mode - TypeError is not thrown when changing the value of
+  TypeError is not thrown when changing the value of the Constructor Properties
-    the Constructor Properties of the Global Object under strict mode
+  of the Global Object
-    (Object)
-flags: [onlyStrict]
 ---*/
 
 var objBak = Object;

test/built-ins/global/10.2.1.1.3-4-27.js

@@ -4,10 +4,8 @@
 /*---
 es5id: 10.2.1.1.3-4-27-s
 description: >
-    Strict Mode - TypeError is not thrown when changing the value of
+  TypeError is not thrown when changing the value of the Constructor Properties
-    the Constructor Properties of the Global Object under strict mode
+  of the Global Object (Number)
-    (Number)
-flags: [onlyStrict]
 ---*/
 
 var numBak = Number;

test/language/expressions/object/method-definition/yield-as-generator-method-binding-identifier.js

@@ -3,11 +3,9 @@
 
 /*---
   description: >
-      `yield` is a valid BindingIdentifier for GeneratorMethods outside of
+      `yield` is a valid BindingIdentifier for GeneratorMethods
-      strict mode.
   features: [generators]
   es6id: 12.1.1
-  flags: [noStrict]
 ---*/
 
 var iter, result;

test/language/expressions/postfix-increment/11.3.1-2-3.js

@@ -4,9 +4,8 @@
 /*---
 es5id: 11.3.1-2-3-s
 description: >
-    Strict Mode - SyntaxError is not thrown if the identifier
+  SyntaxError is not thrown if the identifier 'arguments[...]' appears as a
-    'arguments[...]' appears as a PostfixExpression(arguments++)
+  PostfixExpression(arguments++)
-flags: [onlyStrict]
 ---*/
 
 function testcase() {

test/language/expressions/this/11.1.1-1.js

@@ -3,10 +3,7 @@
 
 /*---
 es5id: 11.1.1-1gs
-description: Strict Mode - 'this' object at the global scope is not undefined
+description: the 'this' object at the global scope is not undefined
-flags: [onlyStrict]
 ---*/
 
-"use strict";
-
 assert.notSameValue(this, undefined);

test/language/expressions/this/S11.1.1_A3.2.js

@@ -7,7 +7,6 @@ info: |
     constructors, return the object
 es5id: 11.1.1_A3.2
 description: Create function. It have property, that returned "this"
-flags: [noStrict]
 ---*/
 
 //CHECK#1