DFG should speculate more aggressively on obvious cases on

DFG should speculate more aggressively on obvious cases on
polymorphic get_by_id
https://bugs.webkit.org/show_bug.cgi?id=69235

Reviewed by Oliver Hunt.

This implements trivial polymorphic get_by_id. It also fixes
problems in the CSE for CheckStructure in the put_by_id
transition case.

Doing this required knowing whether a polymorphic get_by_id stub
was doing a direct access rather than a call of some kind.

Slight speed-up on Kraken and SunSpider. 0.5% speed-up in the
scaled mean of all benchmarks.

* GNUmakefile.list.am:
* JavaScriptCore.xcodeproj/project.pbxproj:
* bytecode/Instruction.h:
(JSC::PolymorphicAccessStructureList::PolymorphicStubInfo::set):
(JSC::PolymorphicAccessStructureList::PolymorphicAccessStructureList):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::cellConstant):
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGGraph.cpp:
(JSC::DFG::Graph::dump):
* dfg/DFGGraph.h:
(JSC::DFG::Graph::addStructureSet):
(JSC::DFG::Graph::addStructureTransitionData):
* dfg/DFGNode.h:
(JSC::DFG::StructureTransitionData::StructureTransitionData):
(JSC::DFG::Node::hasStructureTransitionData):
(JSC::DFG::Node::structureTransitionData):
(JSC::DFG::Node::hasStructureSet):
(JSC::DFG::Node::structureSet):
* dfg/DFGPropagator.cpp:
(JSC::DFG::Propagator::checkStructureLoadElimination):
(JSC::DFG::Propagator::performNodeCSE):
* dfg/DFGRepatch.cpp:
(JSC::DFG::tryBuildGetByIDList):
(JSC::DFG::tryBuildGetByIDProtoList):
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGSpeculativeJIT64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGStructureSet.h: Added.
(JSC::DFG::StructureSet::StructureSet):
(JSC::DFG::StructureSet::add):
(JSC::DFG::StructureSet::addAll):
(JSC::DFG::StructureSet::remove):
(JSC::DFG::StructureSet::contains):
(JSC::DFG::StructureSet::isSubsetOf):
(JSC::DFG::StructureSet::isSupersetOf):
(JSC::DFG::StructureSet::size):
(JSC::DFG::StructureSet::at):
(JSC::DFG::StructureSet::operator[]):
(JSC::DFG::StructureSet::last):
* jit/JITPropertyAccess.cpp:
(JSC::JIT::privateCompileGetByIdSelfList):
(JSC::JIT::privateCompileGetByIdProtoList):
(JSC::JIT::privateCompileGetByIdChainList):
* jit/JITPropertyAccess32_64.cpp:
(JSC::JIT::privateCompileGetByIdSelfList):
(JSC::JIT::privateCompileGetByIdProtoList):
(JSC::JIT::privateCompileGetByIdChainList):
* jit/JITStubs.cpp:
(JSC::DEFINE_STUB_FUNCTION):
(JSC::getPolymorphicAccessStructureListSlot):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96527 268f45cc-cd09-0410-ab3c-d52691b4dbfc