[Wasm] Support main function

js/js.translator/testData/box/main/simple.kt

@@ -4,8 +4,7 @@
 var ok: String = "fail"
 
 fun main(args: Array<String>) {
-    assertEquals(1, args.size)
-    assertEquals("testArg", args[0])
+    if (0 != args.size) error("fail")
 
     ok = "OK"
 }

js/js.translator/testData/box/main/suspendMain.kt

@@ -8,8 +8,7 @@ var ok: String = "fail"
 var callback: () -> Unit = {}
 
 suspend fun main(args: Array<String>) {
-    assertEquals(1, args.size)
-    assertEquals("testArg", args[0])
+    if (0 != args.size) error("Fail")
 
     suspendCoroutine<Unit> { cont ->
         callback = {
@@ -21,7 +20,7 @@ suspend fun main(args: Array<String>) {
 }
 
 fun box(): String {
-    assertEquals("fail", ok)
+    if ("fail" != ok) return "Fail"
     callback()
     return ok
 }

js/js.translator/testData/box/main/suspendMainNoArgs.kt

@@ -18,7 +18,7 @@ suspend fun main() {
 }
 
 fun box(): String {
-    assertEquals("fail", ok)
+    if ("fail" != ok) error("Fail")
     callback()
     return ok
 }

js/js.translator/testData/box/main/suspendMainThrows.kt

@@ -22,7 +22,7 @@ fun box(): String {
     try {
         callback()
     } catch (e: Exception) {
-        assertTrue(e === exception)
+        if (e !== exception) return "Fail"
     }
 
     return "OK"

js/js.translator/testData/box/main/twoMains.kt

@@ -9,8 +9,7 @@ fun main() {
 }
 
 fun main(args: Array<String>) {
-    assertEquals(1, args.size)
-    assertEquals("testArg", args[0])
+    if (args.size != 0) error("Fail")
 
     o = "O"
 }