v := b.Values[j]
			if v.Op == OpInvalid {
				continue
			}
			b.Values[i] = v
			i++
		}
		b.truncateValues(i)
	}
}

func (v *Value) clobbersFlags() bool {
	if opcodeTable[v.Op].clobberFlags {
		return true
	}
	if v.Type.IsTuple() && (v.Type.FieldType(0).IsFlags() || v.Type.FieldType(1).IsFlags()) {
		// This case handles the possibility where a flag value is generated but never used.