KT-740: Make sure that assign and increment operations compute receiver only once:

- Array operations.

js/js.translator/testFiles/expression/misc/cases/KT-740-2.kt

@@ -0,0 +1,59 @@
+package foo
+
+var c0 = 0
+var c1 = 0
+var c2 = 0
+
+class A() {
+ var p = 0
+ fun get(i : Int) : Int {
+    c1++
+    return 0
+ }
+
+ fun set(i : Int, value : Int) {
+    c2++
+ }
+
+}
+
+val a : A = A()
+get() {
+  c0++
+  return $a 
+}
+
+fun box() : String {
+
+    var d = a[1]
+    if (c0 != 1) {
+        return "1"
+    }
+     if (c1 != 1) {
+        return "2"
+    }
+    ++a[1]
+    if (c0 != 2) {
+        return "3"
+    }
+    if (c1 != 2) {
+    return "4"
+    }
+    if (c2 != 1) {
+        return "5"
+    }
+   --a[1]
+    if (c0 != 3) {
+        return "6"
+    }
+  if (c1 != 3) {
+    return "7"
+  }
+  if (c2 != 2) {
+    return "8"
+  }
+   
+
+  return "OK"
+
+}

js/js.translator/testFiles/expression/misc/cases/KT-740.kt

@@ -19,8 +19,4 @@ fun box() : Boolean {
         return false;
     }
   return true
-}
-
-fun main(args : Array<String>) {
-    println(box())
 }