[Isolates] Merge crankshaft (r5922 from bleeding_edge).

test/cctest/test-mark-compact.cc

 // Copyright 2006-2008 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 52 matching lines @@
     address -= kPointerSize;
     CHECK_EQ(address, value);
   }
 
   CHECK_EQ(NULL, address);
   DeleteArray(mem);
 }
 
 
 TEST(Promotion) {
+  // This test requires compaction. If compaction is turned off, we
+  // skip the entire test.
+  if (FLAG_never_compact) return;
+
   // Ensure that we get a compacting collection so that objects are promoted
   // from new space.
   FLAG_gc_global = true;
   FLAG_always_compact = true;
   HEAP->ConfigureHeap(2*256*KB, 4*MB, 4*MB);
 
   InitializeVM();
 
   v8::HandleScope sc;
 
@@ skipping 266 matching lines @@
     Object** g2_objects[] = { g2s1.location(), g2s2.location() };
     global_handles->AddGroup(g1_objects, 2);
     global_handles->AddGroup(g2_objects, 2);
   }
 
   HEAP->CollectGarbage(OLD_POINTER_SPACE);
 
   // All objects should be gone. 5 global handles in total.
   CHECK_EQ(5, NumberOfWeakCalls);
 }