fast := mapfast(t)
	key := mapKeyArg(fast, r, r.Index, false)

	// from:
	//   a,b = m[i]
	// to:
	//   var,b = mapaccess2*(t, m, i)
	//   a = *var
	a := n.Lhs[0]

	var call *ir.CallExpr
	if w := t.Elem().Size(); w <= abi.ZeroValSize {
		fn := mapfn(mapaccess2[fast], t, false)
		call = mkcall1(fn, fn.Type().ResultsTuple(), init, reflectdata.IndexMapRType(base.Pos, r), r.X, key)
	} else {

func mapaccess1_fat(mapType *byte, hmap map[any]any, key *any, zero *byte) (val *any)
func mapaccess2(mapType *byte, hmap map[any]any, key *any) (val *any, pres bool)
func mapaccess2_fast32(mapType *byte, hmap map[any]any, key uint32) (val *any, pres bool)
func mapaccess2_fast64(mapType *byte, hmap map[any]any, key uint64) (val *any, pres bool)

	{"rand32", funcTag, 75},
	{"makemap64", funcTag, 77},
	{"makemap", funcTag, 78},
	{"makemap_small", funcTag, 79},
	{"mapaccess1", funcTag, 80},
	{"mapaccess1_fast32", funcTag, 81},
	{"mapaccess1_fast64", funcTag, 82},
	{"mapaccess1_faststr", funcTag, 83},
	{"mapaccess1_fat", funcTag, 84},
	{"mapaccess2", funcTag, 85},
	{"mapaccess2_fast32", funcTag, 86},
	{"mapaccess2_fast64", funcTag, 87},
	{"mapaccess2_faststr", funcTag, 88},