Remove the --ignition-generators flag.

test/mjsunit/es6/generators-runtime.js

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-// Flags: --ignition-generators
-
 // Test aspects of the generator runtime.
 
 // See:
 // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorfunction-objects
 
 function f() { "use strict"; }
 function* g() { yield 1; }
 var GeneratorFunctionPrototype = Object.getPrototypeOf(g);
 var GeneratorFunction = GeneratorFunctionPrototype.constructor;
 var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
@@ skipping 125 matching lines @@
 function TestPerGeneratorPrototype() {
   assertTrue((function*(){}).prototype !== (function*(){}).prototype);
   assertTrue((function*(){}).prototype !== g.prototype);
   assertSame(GeneratorObjectPrototype, Object.getPrototypeOf(g.prototype));
   assertTrue(!(g.prototype instanceof Function));
   assertSame(typeof (g.prototype), "object");
 
   assertArrayEquals([], Object.getOwnPropertyNames(g.prototype));
 }
 TestPerGeneratorPrototype();