[JS IR BE] Support coroutines

* Move FinallyBlockLowering to common part
* Fix catching of dynamic exception
* Fix bridges for suspend functions
* Disable explicit cast to Unit
* Run lowering per module
* Update some test data

libraries/stdlib/js/irRuntime/tests.kt

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.test
+
+fun <T> assertEquals(a: T, b: T) {
+    if (a != b) throw Exception("")
+}
+