// phi functions, and instructions with a no-pos position
// are examples of instructions that can cause churn.
func (s *State) DebugFriendlySetPosFrom(v *ssa.Value) {
	switch v.Op {
	case ssa.OpPhi, ssa.OpCopy, ssa.OpLoadReg, ssa.OpStoreReg:
		// These are not statements
		s.SetPos(v.Pos.WithNotStmt())
	default:
		p := v.Pos
		if p != src.NoXPos {
			// If the position is defined, update the position.

		return true
	}
	// match: (MOVDaddr {sym} [n] ptr)
	// cond: sym == nil && n == 0 && (ptr.Op == OpArgIntReg || ptr.Op == OpPhi)
	// result: ptr
	for {
		n := auxIntToInt32(v.AuxInt)
		sym := auxToSym(v.Aux)
		ptr := v_0
		if !(sym == nil && n == 0 && (ptr.Op == OpArgIntReg || ptr.Op == OpPhi)) {
			break
		}
		v.copyOf(ptr)
		return true
	}
	return false
}