JS: decomposition of binary operator

#KT-6437 fixed
 #KT-7359 fixed

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

@@ -0,0 +1,17 @@
+package foo
+
+class A {
+    val x: Int
+
+    init {
+        x = fizz(1) + buzz(2)
+    }
+}
+
+fun box(): String {
+    val a = A()
+    assertEquals(3, a.x)
+    assertEquals("fizz(1);buzz(2);", pullLog())
+
+    return "OK"
+}