IR: augmented assignment for array access expressions

compiler/testData/ir/irText/augmentedAssignment1.kt

@@ -1,6 +1,19 @@
 // <<< augmentedAssignment1.txt
-fun test(): Int {
+var p = 0
+
+fun testVariable() {
     var x = 0
-    x += 10
-    return x
-}
+    x += 1
+    x -= 2
+    x *= 3
+    x /= 4
+    x %= 5
+}
+
+fun testProperty() {
+    p += 1
+    p -= 2
+    p *= 3
+    p /= 4
+    p %= 5
+}