Do 2 GCs on LowMemoryNotification instead of 7.

src/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1230 matching lines @@
     if (!shared_info->allows_lazy_compilation()) {
       return false;
     }
 
     // If this is a full script wrapped in a function we do no flush the code.
     if (shared_info->is_toplevel()) {
       return false;
     }
 
     // Age this shared function info.
-    if (shared_info->code_age() < kCodeAgeThreshold) {
+    if (!heap->flush_eagerly() &&
+        shared_info->code_age() < kCodeAgeThreshold) {
       shared_info->set_code_age(shared_info->code_age() + 1);
       return false;
     }
 
     return true;
   }
 
 
   static bool FlushCodeForFunction(Heap* heap, JSFunction* function) {
     if (!IsFlushable(heap, function)) return false;
@@ skipping 56 matching lines @@
                              heap);
     } else if (code->IsSmi()) {
       int value = Smi::cast(code)->value();
       // The regexp has not been compiled yet or there was a compilation error.
       if (value == JSRegExp::kUninitializedValue ||
           value == JSRegExp::kCompilationErrorValue) {
         return;
       }
 
       // Check if we should flush now.
-      if (value == ((heap->sweep_generation() - kRegExpCodeThreshold) & 0xff)) {
+      if (heap->flush_eagerly() ||
+          value == ((heap->sweep_generation() - kRegExpCodeThreshold) & 0xff)) {
         re->SetDataAtUnchecked(JSRegExp::code_index(is_ascii),
                                Smi::FromInt(JSRegExp::kUninitializedValue),
                                heap);
         re->SetDataAtUnchecked(JSRegExp::saved_code_index(is_ascii),
                                Smi::FromInt(JSRegExp::kUninitializedValue),
                                heap);
       }
     }
   }
 
@@ skipping 2806 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal