Reviewed by Maciej Stachowiak.

        HAVE_COMPUTED_GOTO is dependent on the interpreter being enabled
        https://bugs.webkit.org/show_bug.cgi?id=42039

        Separate the existence of computed goto support in the compiler
        from whether or not we are using the interpreter.  All the current
        HAVE(COMPUTED_GOTO) guards are for the interpreter, but I'd like
        the option of using it elsewhere.  The interpreter now uses
        ENABLE(COMPUTED_GOTO_INTERPRETER)

        * bytecode/Instruction.h:
        (JSC::Instruction::Instruction):
        * bytecode/Opcode.h:
        * interpreter/Interpreter.cpp:
        (JSC::Interpreter::Interpreter):
        (JSC::Interpreter::isOpcode):
        (JSC::Interpreter::privateExecute):
        * interpreter/Interpreter.h:
        (JSC::Interpreter::getOpcode):
        (JSC::Interpreter::getOpcodeID):
        * wtf/Platform.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@63056 268f45cc-cd09-0410-ab3c-d52691b4dbfc