Reviewed by Oliver Hunt.

        Support JSVALUE32_64 on MIPS
        https://bugs.webkit.org/show_bug.cgi?id=43999

        Add missing functions to support JSVALUE32_64 on MIPS.
        Remove JSVALUE32 as the default for MIPS.

        * assembler/MIPSAssembler.h:
        (JSC::MIPSAssembler::divd):
        (JSC::MIPSAssembler::mthc1):
        (JSC::MIPSAssembler::cvtwd):
        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::neg32):
        (JSC::MacroAssemblerMIPS::branchOr32):
        (JSC::MacroAssemblerMIPS::set8):
        (JSC::MacroAssemblerMIPS::loadDouble):
        (JSC::MacroAssemblerMIPS::divDouble):
        (JSC::MacroAssemblerMIPS::convertInt32ToDouble):
        (JSC::MacroAssemblerMIPS::branchDouble):
        (JSC::MacroAssemblerMIPS::branchConvertDoubleToInt32):
        (JSC::MacroAssemblerMIPS::zeroDouble):
        * jit/JIT.h:
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::privateCompileCTINativeCall):
        * jit/JITPropertyAccess32_64.cpp:
        (JSC::JIT::privateCompilePutByIdTransition):
        * jit/JITStubs.cpp:
        (JSC::JITThunks::JITThunks):
        * jit/JITStubs.h:
        * wtf/Platform.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@66846 268f45cc-cd09-0410-ab3c-d52691b4dbfc