Update tests for String.prototype.matchAll

As per spec changes (https://github.com/tc39/proposal-string-matchall/pull/35), removed tests related to the removed IsRegExp call.
To prevent older implementations (not observing spec change) from passing, added a new test to verify the reduced number of observable calls to IsRegExp.

Also fix a misreference in `features` frontmatter.

test/built-ins/RegExp/prototype/Symbol.matchAll/internal-regexp-lastindex-not-zero.js

-// Copyright (C) 2018 Peter Wong. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-esid: pending
-description: |
-  Throws TypeError when internally created RegExp's lastIndex is not 0
-info: |
-  RegExp.prototype [ @@matchAll ] ( string )
-    [...]
-    3. Return ? MatchAllIterator(R, string).
-
-  MatchAllIterator ( R, O )
-    [...]
-    2. If ? IsRegExp(R) is true, then
-      [...]
-    3. Else,
-      a. Let matcher be RegExpCreate(R, "g").
-      b. If ? IsRegExp(matcher) is not true, throw a TypeError exception.
-      [...]
-      3. If Get(matcher, "lastIndex") is not 0, throw a TypeError exception.
-features: [Symbol.match, Symbol.matchAll]
----*/
-
-Object.defineProperty(RegExp.prototype, Symbol.match, {
-  get() {
-    this.lastIndex = 1;
-    return true;
-  }
-});
-
-assert.throws(TypeError, function() {
-  RegExp.prototype[Symbol.matchAll].call({}, '');
-});

test/built-ins/RegExp/prototype/Symbol.matchAll/isregexp-internal-regexp-is-false.js → test/built-ins/RegExp/prototype/Symbol.matchAll/isregexp-called-once.js

@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
 esid: pending
-description: Throws TypeError when internally created RegExp's @@match is false
+description: IsRegExp should only be called once
 info: |
   RegExp.prototype [ @@matchAll ] ( string )
     [...]
@@ -13,17 +13,28 @@ info: |
     2. If ? IsRegExp(R) is true, then
       [...]
     3. Else,
-      a. Let matcher be RegExpCreate(R, "g").
-      b. If ? IsRegExp(matcher) is not true, throw a TypeError exception.
+      a. Let flags be "g".
+      b. Let matcher be ? RegExpCreate(R, flags).
 features: [Symbol.match, Symbol.matchAll]
 ---*/
 
+var internalCount = 0;
 Object.defineProperty(RegExp.prototype, Symbol.match, {
-  get() {
-    return false;
+  get: function() {
+    ++internalCount;
+    return true;
   }
 });
 
-assert.throws(TypeError, function() {
-  RegExp.prototype[Symbol.matchAll].call({}, '');
-});
+var count = 0;
+var o = {
+  get [Symbol.match]() {
+    ++count;
+    return false;
+  }
+};
+
+RegExp.prototype[Symbol.matchAll].call(o, '1');
+
+assert.sameValue(0, internalCount);
+assert.sameValue(1, count);

test/built-ins/RegExp/prototype/Symbol.matchAll/isregexp-internal-regexp-throws.js

-// Copyright (C) 2018 Peter Wong. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-esid: pending
-description: Re-throws errors thrown while accessing @@match property
-info: |
-  RegExp.prototype [ @@matchAll ] ( string )
-    [...]
-    3. Return ? MatchAllIterator(R, string).
-
-  MatchAllIterator ( R, O )
-    [...]
-    2. If ? IsRegExp(R) is true, then
-      [...]
-    3. Else,
-      a. Let matcher be RegExpCreate(R, "g").
-      b. If ? IsRegExp(matcher) is not true, throw a TypeError exception.
-features: [Symbol.match, Symbol.matchAll]
----*/
-
-Object.defineProperty(RegExp.prototype, Symbol.match, {
-  get() {
-    throw new Test262Error();
-  }
-});
-
-assert.throws(Test262Error, function() {
-  RegExp.prototype[Symbol.matchAll].call({}, '');
-});

test/built-ins/RegExp/prototype/Symbol.matchAll/regexpcreate-this-throws.js

@@ -13,7 +13,8 @@ info: |
     2. If ? IsRegExp(R) is true, then
       [...]
     3. Else,
-      a. Let R be RegExpCreate(R, "g").
+      a. Let flags be "g".
+      b. Let matcher be ? RegExpCreate(R, flags).
 features: [Symbol.matchAll]
 ---*/
 

test/built-ins/Symbol/matchAll/prop-desc.js

@@ -8,7 +8,7 @@ info: |
     This property has the attributes { [[Writable]]: false, [[Enumerable]]:
     false, [[Configurable]]: false }.
 includes: [propertyHelper.js]
-features: [Symbol.match]
+features: [Symbol.matchAll]
 ---*/
 
 assert.sameValue(typeof Symbol.matchAll, 'symbol');