https://bugs.webkit.org/show_bug.cgi?id=86327

Reviewed by Gavin Barraclough.
        
Merged r117017 from dfgopt.
        
Turns inlined uses of arguments.length into a constant.
        
Turns inlined uses of arguments[constant] into a direct reference to the
argument.
        
Big win on micro-benchmarks. Not yet a win on V8 because the hot uses of
arguments.length and arguments[i] are aliased. I'll leave the aliasing
optimizations to a later patch.

* CMakeLists.txt:
* GNUmakefile.list.am:
* JavaScriptCore.xcodeproj/project.pbxproj:
* Target.pri:
* bytecode/DFGExitProfile.h:
(FrequentExitSite):
(JSC::DFG::FrequentExitSite::FrequentExitSite):
(JSC::DFG::QueryableExitProfile::hasExitSite):
(QueryableExitProfile):
* dfg/DFGAbstractState.cpp:
(JSC::DFG::AbstractState::execute):
* dfg/DFGArgumentsSimplificationPhase.cpp: Added.
(DFG):
(ArgumentsSimplificationPhase):
(JSC::DFG::ArgumentsSimplificationPhase::ArgumentsSimplificationPhase):
(JSC::DFG::ArgumentsSimplificationPhase::run):
(JSC::DFG::performArgumentsSimplification):
* dfg/DFGArgumentsSimplificationPhase.h: Added.
(DFG):
* dfg/DFGAssemblyHelpers.cpp:
(JSC::DFG::AssemblyHelpers::executableFor):
(DFG):
* dfg/DFGAssemblyHelpers.h:
(AssemblyHelpers):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
(JSC::DFG::ByteCodeParser::InlineStackEntry::InlineStackEntry):
* dfg/DFGCSEPhase.cpp:
(JSC::DFG::CSEPhase::getLocalLoadElimination):
(JSC::DFG::CSEPhase::performNodeCSE):
* dfg/DFGDriver.cpp:
(JSC::DFG::compile):
* dfg/DFGGraph.h:
(JSC::DFG::Graph::Graph):
(JSC::DFG::Graph::executableFor):
(Graph):
(JSC::DFG::Graph::clobbersWorld):
* dfg/DFGNode.h:
(JSC::DFG::Node::convertToConstant):
(JSC::DFG::Node::convertToGetLocalUnlinked):
(Node):
(JSC::DFG::Node::unlinkedLocal):
* dfg/DFGNodeType.h:
(DFG):
* dfg/DFGOSRExit.cpp:
(JSC::DFG::OSRExit::considerAddingAsFrequentExitSiteSlow):
* dfg/DFGPredictionPropagationPhase.cpp:
(JSC::DFG::PredictionPropagationPhase::propagate):
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGSpeculativeJIT64.cpp:
(JSC::DFG::SpeculativeJIT::compile):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@118278 268f45cc-cd09-0410-ab3c-d52691b4dbfc