Update handling of directive prologues

Some tests specifically concern the application of the `use strict`
directive as it appears in JavaScript source code. These tests should
*not* be run with the `onlyStrict` flag because relying on the test
runner to enable strict mode makes the semantics of the source code
irrelevant. Update these tests to use the `noStrict` flag.

Other tests concern language semantics that are only valid in strict
mode, but the mechanism for enabling strictness is inconseqential.
Update these tests to use the `onlyStrict` flag and remove any redundant
`use strict` directive prologues contained within.

Still other tests are valid both within and outside of strict mode.
In keeping with the majority of other tests, do not specify any
restrictions on the environments in which these tests may be run.

test/built-ins/Array/prototype/every/15.4.4.16-5-1-s.js

@@ -7,7 +7,7 @@
 /*---
 es5id: 15.4.4.16-5-1-s
 description: Array.prototype.every - thisArg not passed to strict callbackfn
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Array/prototype/filter/15.4.4.20-5-1-s.js

@@ -7,7 +7,7 @@
 /*---
 es5id: 15.4.4.20-5-1-s
 description: Array.prototype.filter - thisArg not passed to strict callbackfn
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Array/prototype/findIndex/Array.prototype.findIndex_this-arg-receiver-coercion-strict.js

@@ -8,6 +8,6 @@ description: >
 flags: [onlyStrict]
 ---*/
 var a = [];
-[1, 2].findIndex(function() { "use strict"; a.push(this); }, "");
+[1, 2].findIndex(function() { a.push(this); }, "");
 assert.sameValue(a[0], "");
 assert.sameValue(a[1], a[0]);

test/built-ins/Array/prototype/forEach/15.4.4.18-5-1-s.js

@@ -7,7 +7,7 @@
 /*---
 es5id: 15.4.4.18-5-1-s
 description: Array.prototype.forEach - thisArg not passed to strict callbackfn
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Array/prototype/map/15.4.4.19-5-1-s.js

@@ -7,7 +7,7 @@
 /*---
 es5id: 15.4.4.19-5-1-s
 description: Array.prototype.map - thisArg not passed to strict callbackfn
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-4-s.js

@@ -9,7 +9,7 @@ es5id: 15.4.4.21-9-c-ii-4-s
 description: >
     Array.prototype.reduce - undefined passed as thisValue to strict
     callbackfn
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-c-ii-4-s.js

@@ -9,7 +9,7 @@ es5id: 15.4.4.22-9-c-ii-4-s
 description: >
     Array.prototype.reduceRight - undefined passed as thisValue to
     strict callbackfn
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Array/prototype/some/15.4.4.17-5-1-s.js

@@ -7,7 +7,7 @@
 /*---
 es5id: 15.4.4.17-5-1-s
 description: Array.prototype.some - thisArg not passed to strict callbackfn
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Array/prototype/sort/S15.4.4.11_A8.js

@@ -5,7 +5,7 @@
 info: Call the comparefn passing undefined as the this value (step 13b)
 es5id: 15.4.4.11_A8
 description: comparefn tests that its this value is undefined
-flags: [onlyStrict]
+flags: [noStrict]
 ---*/
 
 var global = this;

test/built-ins/Function/15.3.2.1-10-6gs.js

@@ -10,7 +10,7 @@ description: >
     Strict Mode - SyntaxError is thrown if a function using the
     Function constructor has two identical parameters in (local)
     strict mode
-flags: [onlyStrict]
+flags: [noStrict]
 ---*/
 
 assert.throws(SyntaxError, function() {

test/built-ins/Function/15.3.2.1-11-1-s.js

@@ -9,7 +9,7 @@ es5id: 15.3.2.1-11-1-s
 description: >
     Duplicate seperate parameter name in Function constructor throws
     SyntaxError in strict mode
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Function/15.3.2.1-11-2-s.js

@@ -15,7 +15,6 @@ includes: [runTestCase.js]
 
 function testcase()
 { 
-  "use strict"; 
   try {
     Function('a','a','return;');
     return true;

test/built-ins/Function/15.3.2.1-11-3-s.js

@@ -9,7 +9,7 @@ es5id: 15.3.2.1-11-3-s
 description: >
     Function constructor having a formal parameter named 'eval' throws
     SyntaxError if function body is strict mode
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Function/15.3.2.1-11-4-s.js

@@ -15,7 +15,6 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-   "use strict";
    try { 
      Function('eval', 'return;');
 	 return true;

test/built-ins/Function/15.3.2.1-11-5-s.js

@@ -9,7 +9,7 @@ es5id: 15.3.2.1-11-5-s
 description: >
     Duplicate combined parameter name in Function constructor throws
     SyntaxError in strict mode
-flags: [onlyStrict]
+flags: [noStrict]
 includes: [runTestCase.js]
 ---*/
 

test/built-ins/Function/15.3.2.1-11-6-s.js

@@ -15,7 +15,6 @@ includes: [runTestCase.js]
 
 function testcase()
 { 
-  "use strict"; 
   try {
      Function('a,a','return a;');
 	 return true;

test/built-ins/Function/15.3.2.1-11-7-s.js

@@ -15,7 +15,6 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-   "use strict";
    try {
      Function('arguments', 'return;');
      return true;

test/built-ins/Function/15.3.2.1-11-8-s.js

@@ -16,7 +16,6 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-        "use strict";
 
         var foo = new Function("baz", "qux", "baz", "return 0;");
         return true;

test/built-ins/Function/15.3.2.1-11-9-s.js

@@ -11,13 +11,10 @@ description: >
     the Function constructor that has three identical parameters and
     there is no explicit 'use strict' in the function constructor's
     body
-flags: [onlyStrict]
 includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-        "use strict";
-
         var foo = new Function("baz", "baz", "baz", "return 0;");
         return true;
     }

test/built-ins/Function/15.3.5-1gs.js

@@ -12,6 +12,7 @@ description: >
 flags: [onlyStrict]
 ---*/
 
+"use strict";
 function _15_3_5_1_gs() {}
 
 assert.throws(TypeError, function() {