DFG JIT should inline Math.abs

DFG JIT should inline Math.abs
https://bugs.webkit.org/show_bug.cgi?id=68227

Source/JavaScriptCore:

Reviewed by Oliver Hunt.

This adds the ability to track intrinsic functions throughout the
host function infrastructure, so that the DFG can easily query
whether or not a call's target is intrinsic, and if so, which
intrinsic it is.

On top of this, it adds Math.abs intrinsics to DFG. Call(Math.abs)
is transformed into ValueToNumber<-ArithAbs nodes. These nodes
then get optimized using the usual tricks.

Also had to make a completely unrelated change to
DateInstanceCache.h in order to fix a preexisting alphabetical
sorting problem in JSGlobalData.h

This results in a big win in imaging-gaussian-blur: 61% faster
than before. The net win on Kraken is around 13%.

* JavaScriptCore.xcodeproj/project.pbxproj:
* create_hash_table:
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGGraph.h:
(JSC::DFG::Graph::isFunctionConstant):
(JSC::DFG::Graph::valueOfFunctionConstant):
* dfg/DFGIntrinsic.h: Added.
* dfg/DFGJITCodeGenerator.h:
(JSC::DFG::JITCodeGenerator::isFunctionConstant):
(JSC::DFG::JITCodeGenerator::valueOfFunctionConstant):
* dfg/DFGJITCompiler.h:
(JSC::DFG::JITCompiler::isFunctionConstant):
(JSC::DFG::JITCompiler::valueOfFunctionConstant):
* dfg/DFGNode.h:
* dfg/DFGPropagator.cpp:
(JSC::DFG::Propagator::propagateNode):
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* jit/JITStubs.cpp:
(JSC::JITThunks::hostFunctionStub):
* jit/JITStubs.h:
* runtime/DateInstanceCache.h:
* runtime/Executable.cpp:
(JSC::ExecutableBase::intrinsic):
(JSC::NativeExecutable::intrinsic):
* runtime/Executable.h:
(JSC::NativeExecutable::create):
(JSC::NativeExecutable::finishCreation):
* runtime/JSGlobalData.cpp:
(JSC::JSGlobalData::getHostFunction):
* runtime/JSGlobalData.h:
* runtime/Lookup.cpp:
(JSC::HashTable::createTable):
(JSC::setUpStaticFunctionSlot):
* runtime/Lookup.h:
(JSC::HashEntry::initialize):
(JSC::HashEntry::intrinsic):

Source/WebCore:

Reviewed by Oliver Hunt.

Added JavaScriptCore/dfg to include path path. Changed the bindings
scripts to handle the presence of intrinsics.

* CMakeLists.txt:
* bindings/scripts/CodeGeneratorJS.pm:
(GenerateHashTable):

Source/WebKit:

Reviewed by Oliver Hunt.

Added JavaScriptCore/dfg to include path path.

* CMakeLists.txt:

Source/WebKit2:

Reviewed by Oliver Hunt.

Added JavaScriptCore/dfg to include path path.

* CMakeLists.txt:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@95310 268f45cc-cd09-0410-ab3c-d52691b4dbfc