cmd/gc: mapassign2 doesn't exist anymore.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6997043

src/cmd/gc/builtin.c

@@ -65,7 +65,6 @@ char *runtimeimport =
 	"func @\"\".mapaccess1(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any) (@\"\".val any)\n"
 	"func @\"\".mapaccess2(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any) (@\"\".val any, @\"\".pres bool)\n"
 	"func @\"\".mapassign1(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any, @\"\".val any)\n"
-	"func @\"\".mapassign2(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any, @\"\".val any, @\"\".pres bool)\n"
 	"func @\"\".mapiterinit(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".hiter *any)\n"
 	"func @\"\".mapdelete(@\"\".mapType *byte, @\"\".hmap map[any]any, @\"\".key any)\n"
 	"func @\"\".mapiternext(@\"\".hiter *any)\n"

src/cmd/gc/runtime.go

@@ -91,7 +91,6 @@ func makemap(mapType *byte, hint int64) (hmap map[any]any)
 func mapaccess1(mapType *byte, hmap map[any]any, key any) (val any)
 func mapaccess2(mapType *byte, hmap map[any]any, key any) (val any, pres bool)
 func mapassign1(mapType *byte, hmap map[any]any, key any, val any)
-func mapassign2(mapType *byte, hmap map[any]any, key any, val any, pres bool)
 func mapiterinit(mapType *byte, hmap map[any]any, hiter *any)
 func mapdelete(mapType *byte, hmap map[any]any, key any)
 func mapiternext(hiter *any)