// match: (SelectN [0] call:(StaticLECall {sym} a x))
	// cond: needRaceCleanup(sym, call) && clobber(call)
	// result: x
	for {
		if auxIntToInt64(v.AuxInt) != 0 {
			break
		}
		call := v_0
		if call.Op != OpStaticLECall || len(call.Args) != 2 {
			break
		}
		sym := auxToCall(call.Aux)
		x := call.Args[1]
		if !(needRaceCleanup(sym, call) && clobber(call)) {
			break
		}