https://bugs.webkit.org/show_bug.cgi?id=122318

Reviewed by Geoffrey Garen.
        
This all now works. This patch just updates our implementation to work with LLVM trunk,
and removes all of the old code that tried to do OSR exits and heap accesses without
the benefit of those intrinsics.
        
In particular:
        
- StackMaps parsing now uses the new, less compact, but more future-proof, format.
        
- Remove the ftlUsesStackmaps() option and hard-code ftlUsesStackmaps = true. Remove
  all code for ftlUsesStackmaps = false, since that was only there for back when we
  didn't have the intrinsics.
        
- Remove the other experimental OSR options (useLLVMOSRExitIntrinsic,
  ftlTrapsOnOSRExit, and FTLOSRExitOmitsMarshalling).
        
- Remove LowerDFGToLLVM's use of the ExitThunkGenerator since we don't need to generate
  the exit thunks until after we parse the stackmaps.
        
- Remove all of the exit thunk and compiler code for the no-stackmaps case.

* dfg/DFGDriver.cpp:
(JSC::DFG::compileImpl):
* ftl/FTLCompile.cpp:
(JSC::FTL::mmAllocateDataSection):
* ftl/FTLExitThunkGenerator.cpp:
(JSC::FTL::ExitThunkGenerator::emitThunk):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLocation.cpp:
(JSC::FTL::Location::forStackmaps):
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::LowerDFGToLLVM::LowerDFGToLLVM):
(JSC::FTL::LowerDFGToLLVM::lower):
(JSC::FTL::LowerDFGToLLVM::compileGetById):
(JSC::FTL::LowerDFGToLLVM::compileInvalidationPoint):
(JSC::FTL::LowerDFGToLLVM::appendOSRExit):
(JSC::FTL::LowerDFGToLLVM::emitOSRExitCall):
(JSC::FTL::LowerDFGToLLVM::callStackmap):
(JSC::FTL::LowerDFGToLLVM::addExitArgumentForNode):
* ftl/FTLOSRExitCompilationInfo.h:
(JSC::FTL::OSRExitCompilationInfo::OSRExitCompilationInfo):
* ftl/FTLOSRExitCompiler.cpp:
(JSC::FTL::compileStub):
(JSC::FTL::compileFTLOSRExit):
* ftl/FTLStackMaps.cpp:
(JSC::FTL::StackMaps::Location::parse):
(JSC::FTL::StackMaps::parse):
(WTF::printInternal):
* ftl/FTLStackMaps.h:
* ftl/FTLThunks.cpp:
(JSC::FTL::osrExitGenerationThunkGenerator):
* ftl/FTLThunks.h:
(JSC::FTL::Thunks::getOSRExitGenerationThunk):
* runtime/Options.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158535 268f45cc-cd09-0410-ab3c-d52691b4dbfc