Don't flush code for generator functions.

test/mjsunit/regress/regress-2681.js

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-// Flags: --expose_gc
+// Flags: --expose-gc --noincremental-marking --harmony-generators
 
-p1 =  { };
-p2 =  { };
-p3 =  { x : 1 };
-p2.__proto__ = p3
-p1.__proto__ = p2
+// Check that we are not flushing code for generators.
 
-// Normalize p1.
-p1.z = 1
-delete p1.z
-
-// Make sure all objects are in old space.
-for (var i = 0; i < 10; i++) gc();
-
-function f2() {
-  p2.x;
+function flush_all_code() {
+  // Each GC ages code, and currently 6 gcs will flush all code.
+  for (var i = 0; i < 10; i++) gc();
 }
 
-function f1() {
-  return p1.x;
+function* g() {
+  yield 1;
+  yield 2;
 }
 
-// Create load stub in p2.
-for (var i = 0; i < 10; i++) f2();
+var o = g();
+assertEquals({ value: 1, done: false }, o.next());
 
-// Create load stub in p2 for p1.
-for (var i = 0; i < 10; i++) f1();
+flush_all_code();
 
-assertEquals(1, f1());
-
-p2.x = 2;
-
-assertEquals(2, f1());
+assertEquals({ value: 2, done: false }, o.next());
+assertEquals({ value: undefined, done: true }, o.next());