[matchAll] pass a global regex (#2399)

- also, expect the right kind of error in `flags-undefined-throws.js`

Fixes #2398

test/built-ins/String/prototype/matchAll/flags-undefined-throws.js

@@ -28,6 +28,6 @@ Object.defineProperty(RegExp.prototype, 'flags', {
   }
 });
 
-assert.throws(Test262Error, function () {
+assert.throws(TypeError, function () {
   ''.matchAll(/a/g);
 });

test/built-ins/String/prototype/matchAll/regexp-get-matchAll-throws.js

@@ -13,7 +13,7 @@ info: |
 features: [Symbol.matchAll, String.prototype.matchAll]
 ---*/
 
-var regexp = /./;
+var regexp = /./g;
 Object.defineProperty(regexp, Symbol.matchAll, {
   get() {
     throw new Test262Error();

test/built-ins/String/prototype/matchAll/regexp-matchAll-is-undefined-or-null.js

@@ -16,7 +16,7 @@ info: |
 features: [Symbol.matchAll, String.prototype.matchAll]
 ---*/
 
-var regexp = /./;
+var regexp = /./g;
 var callCount = 0;
 var arg;
 var obj = {};

test/built-ins/String/prototype/matchAll/regexp-matchAll-throws.js

@@ -11,7 +11,7 @@ info: |
 features: [Symbol.matchAll, String.prototype.matchAll]
 ---*/
 
-var regexp = /./;
+var regexp = /./g;
 regexp[Symbol.matchAll] = function() {
   throw new Test262Error();
 };

test/built-ins/String/prototype/matchAll/regexp-prototype-get-matchAll-throws.js

@@ -18,5 +18,5 @@ Object.defineProperty(RegExp.prototype, Symbol.matchAll, {
 });
 
 assert.throws(Test262Error, function() {
-  ''.matchAll(/./);
+  ''.matchAll(/./g);
 });

test/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-invocation.js

@@ -25,7 +25,7 @@ RegExp.prototype[Symbol.matchAll] = function() {
   return returnVal;
 };
 
-var regexp = /./;
+var regexp = /./g;
 var str = '';
 
 assert.sameValue(str.matchAll(regexp), returnVal);

test/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-throws.js

@@ -18,5 +18,5 @@ RegExp.prototype[Symbol.matchAll] = function() {
 };
 
 assert.throws(Test262Error, function() {
-  ''.matchAll(/./);
+  ''.matchAll(/./g);
 });