Reviewed by Gavin Barraclough.

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

        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@90177 268f45cc-cd09-0410-ab3c-d52691b4dbfc