JS backend: support for while/do while with complex conditions

js/js.translator/testData/expression/while/cases/whileWithComplexCondition.kt

@@ -0,0 +1,31 @@
+package foo
+
+var global: String = ""
+
+fun box(): String {
+    var i:Int = 0
+
+    i = 0
+    global = ""
+    while(try { global += "A"; i } finally {}  < 3)
+        i++
+    assertEquals("AAAA", global)
+    assertEquals(3, i)
+
+    i = 0
+    global = ""
+    while(try { global += "A"; i } finally {} < 10) {
+        if (i==3) break
+        i++
+    }
+    assertEquals("AAAA", global)
+    assertEquals(3, i)
+
+    i = 0
+    global = ""
+    while( try { global += "A"; i } finally{} < 3)
+        try { global += "B"; i++} finally {}
+    assertEquals("ABABABA", global)
+
+    return "OK"
+}