Reviewed by Gavin Barraclough.

        Add optimised paths for a few maths functions
        https://bugs.webkit.org/show_bug.cgi?id=63757

        Relanding as a Mac only patch.

        This adds specialised thunks for Math.abs, Math.round, Math.ceil,
        Math.floor, Math.log, and Math.exp as they are apparently more
        important in real web content than we thought, which is somewhat
        mind-boggling.  On average doubles the performance of the common
        cases (eg. actually passing numbers in).  They're not as efficient
        as they could be, but this way gives them the most portability.

        * assembler/MacroAssemblerARM.h:
        (JSC::MacroAssemblerARM::supportsDoubleBitops):
        (JSC::MacroAssemblerARM::andnotDouble):
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::supportsDoubleBitops):
        (JSC::MacroAssemblerARMv7::andnotDouble):
        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::andnotDouble):
        (JSC::MacroAssemblerMIPS::supportsDoubleBitops):
        * assembler/MacroAssemblerSH4.h:
        (JSC::MacroAssemblerSH4::supportsDoubleBitops):
        (JSC::MacroAssemblerSH4::andnotDouble):
        * assembler/MacroAssemblerX86.h:
        (JSC::MacroAssemblerX86::supportsDoubleBitops):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::andnotDouble):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::supportsDoubleBitops):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::andnpd_rr):
        * create_hash_table:
        * jit/SpecializedThunkJIT.h:
        (JSC::SpecializedThunkJIT::finalize):
        (JSC::SpecializedThunkJIT::callDoubleToDouble):
        * jit/ThunkGenerators.cpp:
        (JSC::floorThunkGenerator):
        (JSC::ceilThunkGenerator):
        (JSC::roundThunkGenerator):
        (JSC::expThunkGenerator):
        (JSC::logThunkGenerator):
        (JSC::absThunkGenerator):
        * jit/ThunkGenerators.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@90237 268f45cc-cd09-0410-ab3c-d52691b4dbfc