Implement graph trimming in ControlReducer.

test/cctest/cctest.status

 # Copyright 2011 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 132 matching lines @@
   'test-debug/DebugStepFunctionCall': [PASS, NO_VARIANTS],
   'test-debug/DebugStepFunctionApply': [PASS, NO_VARIANTS],
   'test-debug/ScriptNameAndData': [PASS, NO_VARIANTS],
   'test-debug/ContextData': [PASS, NO_VARIANTS],
   'test-debug/DebugBreakInMessageHandler': [PASS, NO_VARIANTS],
   'test-debug/CallFunctionInDebugger': [PASS, NO_VARIANTS],
   'test-debug/CallingContextIsNotDebugContext': [PASS, NO_VARIANTS],
   'test-debug/DebugEventContext': [PASS, NO_VARIANTS],
   'test-debug/DebugBreakInline': [PASS, NO_VARIANTS],
 
+  # Scheduling and verifying of empty for loops is broken.
+  'test-run-jsbranches/EmptyFor': [SKIP],
+
   ############################################################################
   # Slow tests.
   'test-api/Threading1': [PASS, ['mode == debug', SLOW]],
   'test-api/Threading2': [PASS, ['mode == debug', SLOW]],
   'test-api/Threading3': [PASS, ['mode == debug', SLOW]],
   'test-api/Threading4': [PASS, ['mode == debug', SLOW]],
   'test-strings/StringOOM*': [PASS, ['mode == debug', SKIP]],
 }],  # ALWAYS
 
 ##############################################################################
@@ skipping 279 matching lines @@
   'test-api/Float32Array' : [SKIP],
   'test-api/Float64Array' : [SKIP],
   'test-api/Regress2333' : [SKIP],
   'test-alloc/StressHandles' : [SKIP],
   'test-alloc/StressJS' : [SKIP],
   'test-accessors/HandleScopePop' : [SKIP],
   'test-accessors/Gc' : [SKIP],
 
 }],  # 'arch == nacl_ia32 or arch == nacl_x64'
 ]