Add a --nox86 flag to allow disabling x86 tests

def parseArgv():

    global gUseArm

    global gUseX86

    global gRunOTCCOutput

    for arg in sys.argv[1:]:

        if arg == "--noarm":

            print "--noarm detected, not testing on ARM"

            print "--noarm: not testing ARM"

            gUseArm = False

        elif arg == "--nox86":

            print "--nox86: not testing x86"

            gUseX86 = False

        elif arg == "--norunotcc":

            print "--norunotcc detected, not running OTCC output"

            gRunOTCCOutput = False