INT 2F - Microsoft Profiler (PROF.COM/VPROD.386) - STOP PROFILING

	AX = 4504h
Notes:	profiling is also turned off by the key combination
	  LeftShift + RightShift
	for PROF.COM, this programs the CMOS clock by reading register 0Ch
	  and clearing bit 6 of register 0Bh.  It then masks IRQ8.
SeeAlso: AX=4503h,AX=4505h,AX=4506h,AX=4507h