Do 2 GCs on LowMemoryNotification instead of 7.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
===================================================================
--- test/cctest/test-heap.cc	(revision 12520)
+++ test/cctest/test-heap.cc	(working copy)
@@ -1941,6 +1941,57 @@
 }
 
 
+// Tests the FlushEagerly class from heap.h
+TEST(ReleaseUnoptimizedCode) {
+  i::FLAG_trace_gc = true;
+  // The optimizer can allocate stuff, messing up the test.
+  i::FLAG_crankshaft = false;
+  if (i::FLAG_always_opt) return;
+  InitializeVM();
+  v8::HandleScope scope;
+
+  PagedSpace* code_space = HEAP->code_space();
+  CompileRun("var a = [];"
+             "var sum = 0;"
+             "for (var j = 0; j < 1e4; j++) {"
+             "  var fn = new Function("
+             "      'var k; var o = {}; for (k in o) { } return ' + j + ';');"
+             "  sum += fn();"
+             "}");
+  HEAP->CollectAllGarbage(Heap::kNoGCFlags, "triggered for preparation");
+  printf("%d\n", code_space->CountTotalPages());
+  CHECK_GE(5, code_space->CountTotalPages());
+  HEAP->CollectAllAvailableGarbage("triggered really hard");
+  printf("%d\n", code_space->CountTotalPages());
+  CHECK_LE(2, code_space->CountTotalPages());
+}
+
+
+// Tests the FlushEagerly class from heap.h
+TEST(ReleaseRegexpCode) {
+  i::FLAG_trace_gc = true;
+  // The optimizer can allocate stuff, messing up the test.
+  i::FLAG_crankshaft = false;
+  if (i::FLAG_always_opt) return;
+  InitializeVM();
+  v8::HandleScope scope;
+
+  PagedSpace* code_space = HEAP->code_space();
+  CompileRun("var a = [];"
+             "for (var j = 0; j < 2e4; j++) {"
+             "  var re = RegExp(j + '?');"
+             "  a.push(re);"
+             "  re.test('foo');"
+             "}");
+  HEAP->CollectAllGarbage(Heap::kNoGCFlags, "triggered for preparation");
+  printf("%d\n", code_space->CountTotalPages());
+  CHECK_GT(15, code_space->CountTotalPages());
+  HEAP->CollectAllAvailableGarbage("triggered really hard");
+  printf("%d\n", code_space->CountTotalPages());
+  CHECK_LE(2, code_space->CountTotalPages());
+}
+
+
 TEST(Regress2237) {
   InitializeVM();
   v8::HandleScope scope;