Enable ES6 generators

test/mjsunit/es6/generators-parsing.js

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-// Flags: --harmony-generators
-
 // Test basic generator syntax.
 
 // Yield statements.
 function* g() { yield 3; yield 4; }
 
 // Yield expressions.
 function* g() { (yield 3) + (yield 4); }
 
 // Yield without a RHS.
 function* g() { yield; }
@@ skipping 84 matching lines @@
 assertThrows("function* g() { yield 3 + yield 4; }", SyntaxError);
 
 // Yield is still a future-reserved-word in strict mode
 assertThrows("function f() { \"use strict\"; var yield = 13; }", SyntaxError);
 
 // The name of the NFE is let-bound in G, so is invalid.
 assertThrows("function* g() { yield (function yield() {}); }", SyntaxError);
 
 // In generators, yield is invalid as a formal argument name.
 assertThrows("function* g(yield) { yield (10); }", SyntaxError);