https://bugs.webkit.org/show_bug.cgi?id=111520

Reviewed by Geoffrey Garen.
        
All nodes are live before DCE. We don't need to check that they aren't, because they
definitely will be.

* dfg/DFGArgumentsSimplificationPhase.cpp:
(JSC::DFG::ArgumentsSimplificationPhase::run):
* dfg/DFGCFAPhase.cpp:
(JSC::DFG::CFAPhase::performBlockCFA):
* dfg/DFGCFGSimplificationPhase.cpp:
(JSC::DFG::CFGSimplificationPhase::keepOperandAlive):
* dfg/DFGCSEPhase.cpp:
(JSC::DFG::CSEPhase::pureCSE):
(JSC::DFG::CSEPhase::int32ToDoubleCSE):
(JSC::DFG::CSEPhase::constantCSE):
(JSC::DFG::CSEPhase::weakConstantCSE):
(JSC::DFG::CSEPhase::getCalleeLoadElimination):
(JSC::DFG::CSEPhase::getArrayLengthElimination):
(JSC::DFG::CSEPhase::globalVarLoadElimination):
(JSC::DFG::CSEPhase::scopedVarLoadElimination):
(JSC::DFG::CSEPhase::globalVarWatchpointElimination):
(JSC::DFG::CSEPhase::globalVarStoreElimination):
(JSC::DFG::CSEPhase::scopedVarStoreElimination):
(JSC::DFG::CSEPhase::getByValLoadElimination):
(JSC::DFG::CSEPhase::checkStructureElimination):
(JSC::DFG::CSEPhase::structureTransitionWatchpointElimination):
(JSC::DFG::CSEPhase::putStructureStoreElimination):
(JSC::DFG::CSEPhase::getByOffsetLoadElimination):
(JSC::DFG::CSEPhase::putByOffsetStoreElimination):
(JSC::DFG::CSEPhase::getPropertyStorageLoadElimination):
(JSC::DFG::CSEPhase::checkArrayElimination):
(JSC::DFG::CSEPhase::getIndexedPropertyStorageLoadElimination):
(JSC::DFG::CSEPhase::getMyScopeLoadElimination):
(JSC::DFG::CSEPhase::getLocalLoadElimination):
(JSC::DFG::CSEPhase::setLocalStoreElimination):
(JSC::DFG::CSEPhase::performNodeCSE):
* dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::fixupNode):
(JSC::DFG::FixupPhase::fixupSetLocalsInBlock):
* dfg/DFGPredictionPropagationPhase.cpp:
(JSC::DFG::PredictionPropagationPhase::propagate):
* dfg/DFGStructureCheckHoistingPhase.cpp:
(JSC::DFG::StructureCheckHoistingPhase::run):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144939 268f45cc-cd09-0410-ab3c-d52691b4dbfc