DFG JIT - merge changes between 95905 - 96175

DFG JIT - merge changes between 95905 - 96175
https://bugs.webkit.org/show_bug.cgi?id=68963

Reviewed by Sam Weinig.

Merge missing changes from bug#68677, bug#68784, bug#68785.

* dfg/DFGJITCompiler32_64.cpp:
(JSC::DFG::JITCompiler::exitSpeculativeWithOSR):
(JSC::DFG::JITCompiler::compileEntry):
(JSC::DFG::JITCompiler::compileBody):
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96178 268f45cc-cd09-0410-ab3c-d52691b4dbfc