JS: decomposition of binary operator

#KT-6437 fixed
 #KT-7359 fixed

js/js.translator/testData/inlineEvaluationOrder/cases/assignment.kt

@@ -0,0 +1,14 @@
+package foo
+
+class A(var x: Int) {
+    override fun toString(): String = "A($x)"
+}
+
+fun box(): String {
+    val a = A(10)
+    fizz(a).x = buzz(20)
+    assertEquals(20, a.x)
+    assertEquals("fizz(A(10));buzz(20);", pullLog())
+
+    return "OK"
+}