add tests

gnovm/tests/files/ptrmap1.gno

@@ -22,7 +22,11 @@ func init() {
 func main() {
 	r := GetFromMap()
 	println(r == 5)
+
+	*i = 2
+	println(r == 5)
 }
 
 // Output:
 // true
+// true

gnovm/tests/files/ptrmap2.gno

@@ -26,8 +26,12 @@ func main() {
 	var j = 0
 	j1 := &j
 	println(m[&j1])
+
+	*i = 2
+	println(r == 5)
 }
 
 // Output:
 // true
 // 0
+// true

gnovm/tests/files/ptrmap7.gno

@@ -0,0 +1,19 @@
+// PKGPATH: gno.land/r/ptr_map
+package ptr_map
+
+var m = make(map[*int]string)
+
+func foo(x, y int) {
+	m[&x] = "a"
+	m[&y] = "b"
+	println(m[&x])
+	println(m[&y])
+}
+
+func main() {
+	foo(1, 1)
+}
+
+// Output:
+// a
+// b