FTL OSRExit construction should be based on methods that return ExitValues rather than methods that add ExitValues to OSRExit
https://bugs.webkit.org/show_bug.cgi?id=136978

Reviewed by Dean Jackson.

* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::LowerDFGToLLVM::buildExitArguments):
(JSC::FTL::LowerDFGToLLVM::exitValueForNode):
(JSC::FTL::LowerDFGToLLVM::exitArgument):
(JSC::FTL::LowerDFGToLLVM::addExitArgumentForNode): Deleted.
(JSC::FTL::LowerDFGToLLVM::tryToSetConstantExitArgument): Deleted.
(JSC::FTL::LowerDFGToLLVM::addExitArgument): Deleted.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@173795 268f45cc-cd09-0410-ab3c-d52691b4dbfc