Use moveDoubleToInts in SpecializedThunkJIT::returnDouble for non-X86 JSVALUE32_64 ports.
https://bugs.webkit.org/show_bug.cgi?id=124936

Patch by Julien Brianceau <jbriance@cisco.com> on 2013-11-29
Reviewed by Zoltan Herczeg.

The moveDoubleToInts implementations in ARM, MIPS and SH4 macro assemblers do not clobber
src FPRegister and are likely to be more efficient than the current generic implementation
using the stack.

* jit/SpecializedThunkJIT.h:
(JSC::SpecializedThunkJIT::returnDouble):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159873 268f45cc-cd09-0410-ab3c-d52691b4dbfc