Reviewed by Geoff Garen.

        On x86-64 allow JSImmediate to encode 64-bit double precision values.
        This patch only affects builds that set USE(ALTERNATE_JSIMMEDIATE).
        Updates the implementation of JSValuePtr:: and JSImmediate:: methods
        that operate on neumeric values to be be aware of the new representation.
        When this representation is in use, the class JSNumberCell is redundant
        and is compiled out.

        The format of the new immediate representation is documented in JSImmediate.h.

        * JavaScriptCore.exp:
        * assembler/MacroAssembler.h:
        (JSC::MacroAssembler::subPtr):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::):
        (JSC::X86Assembler::subq_rr):
        (JSC::X86Assembler::movq_rr):
        (JSC::X86Assembler::ucomisd_rr):
        (JSC::X86Assembler::X86InstructionFormatter::twoByteOp64):
        * interpreter/Interpreter.cpp:
        (JSC::Interpreter::cti_op_stricteq):
        (JSC::Interpreter::cti_op_nstricteq):
        * jit/JIT.cpp:
        (JSC::JIT::compileOpStrictEq):
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITArithmetic.cpp:
        (JSC::JIT::compileFastArith_op_lshift):
        (JSC::JIT::compileFastArith_op_rshift):
        (JSC::JIT::compileFastArith_op_bitand):
        (JSC::JIT::compileFastArith_op_mod):
        (JSC::JIT::compileFastArith_op_add):
        (JSC::JIT::compileFastArith_op_mul):
        (JSC::JIT::compileFastArith_op_post_inc):
        (JSC::JIT::compileFastArith_op_post_dec):
        (JSC::JIT::compileFastArith_op_pre_inc):
        (JSC::JIT::compileFastArith_op_pre_dec):
        (JSC::JIT::putDoubleResultToJSNumberCellOrJSImmediate):
        (JSC::JIT::compileBinaryArithOp):
        * jit/JITInlineMethods.h:
        (JSC::JIT::emitJumpIfBothJSCells):
        (JSC::JIT::emitJumpIfEitherNumber):
        (JSC::JIT::emitJumpIfNotEitherNumber):
        (JSC::JIT::emitJumpIfImmediateIntegerNumber):
        (JSC::JIT::emitJumpIfNotImmediateIntegerNumber):
        (JSC::JIT::emitJumpIfNotImmediateIntegerNumbers):
        (JSC::JIT::emitJumpSlowCaseIfNotImmediateIntegerNumber):
        (JSC::JIT::emitJumpSlowCaseIfNotImmediateIntegerNumbers):
        (JSC::JIT::emitFastArithDeTagImmediate):
        (JSC::JIT::emitFastArithDeTagImmediateJumpIfZero):
        (JSC::JIT::emitFastArithReTagImmediate):
        (JSC::JIT::emitFastArithIntToImmNoCheck):
        * runtime/JSCell.h:
        * runtime/JSGlobalData.cpp:
        (JSC::JSGlobalData::JSGlobalData):
        * runtime/JSImmediate.cpp:
        (JSC::JSImmediate::toThisObject):
        (JSC::JSImmediate::toObject):
        (JSC::JSImmediate::toString):
        * runtime/JSImmediate.h:
        (JSC::wtf_reinterpret_cast):
        (JSC::JSImmediate::isNumber):
        (JSC::JSImmediate::isIntegerNumber):
        (JSC::JSImmediate::isDoubleNumber):
        (JSC::JSImmediate::isPositiveIntegerNumber):
        (JSC::JSImmediate::areBothImmediateIntegerNumbers):
        (JSC::JSImmediate::makeInt):
        (JSC::JSImmediate::makeDouble):
        (JSC::JSImmediate::doubleValue):
        (JSC::doubleToBoolean):
        (JSC::JSImmediate::toBoolean):
        (JSC::JSImmediate::getTruncatedUInt32):
        (JSC::JSImmediate::makeOutOfIntegerRange):
        (JSC::JSImmediate::from):
        (JSC::JSImmediate::getTruncatedInt32):
        (JSC::JSImmediate::toDouble):
        (JSC::JSImmediate::getUInt32):
        (JSC::JSValuePtr::isInt32Fast):
        (JSC::JSValuePtr::isUInt32Fast):
        (JSC::JSValuePtr::areBothInt32Fast):
        (JSC::JSFastMath::canDoFastBitwiseOperations):
        (JSC::JSFastMath::xorImmediateNumbers):
        (JSC::JSFastMath::canDoFastRshift):
        (JSC::JSFastMath::canDoFastUrshift):
        (JSC::JSFastMath::rightShiftImmediateNumbers):
        (JSC::JSFastMath::canDoFastAdditiveOperations):
        (JSC::JSFastMath::addImmediateNumbers):
        (JSC::JSFastMath::subImmediateNumbers):
        * runtime/JSNumberCell.cpp:
        (JSC::jsNumberCell):
        * runtime/JSNumberCell.h:
        (JSC::createNumberStructure):
        (JSC::isNumberCell):
        (JSC::asNumberCell):
        (JSC::jsNumber):
        (JSC::JSValuePtr::isDoubleNumber):
        (JSC::JSValuePtr::getDoubleNumber):
        (JSC::JSValuePtr::isNumber):
        (JSC::JSValuePtr::uncheckedGetNumber):
        (JSC::jsNaN):
        (JSC::JSValuePtr::getNumber):
        (JSC::JSValuePtr::numberToInt32):
        (JSC::JSValuePtr::numberToUInt32):
        * runtime/JSValue.h:
        * runtime/NumberConstructor.cpp:
        (JSC::numberConstructorNegInfinity):
        (JSC::numberConstructorPosInfinity):
        (JSC::numberConstructorMaxValue):
        (JSC::numberConstructorMinValue):
        * runtime/NumberObject.cpp:
        (JSC::constructNumber):
        * runtime/NumberObject.h:
        * runtime/Operations.h:
        (JSC::JSValuePtr::equal):
        (JSC::JSValuePtr::equalSlowCaseInline):
        (JSC::JSValuePtr::strictEqual):
        (JSC::JSValuePtr::strictEqualSlowCaseInline):
        * wtf/Platform.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@39958 268f45cc-cd09-0410-ab3c-d52691b4dbfc