[Wasm] Support coroutines

- Reuse JS IR Suspend function lowering
  - Fix types
  - Disable reinterpretCast-based optimization for inline
    classes
- Add basic support to Wasm stdlib
- Explicitly transform suspend functions into regular functions
  with continuations
- Clean suspend function handling from JS IR codegen

libraries/stdlib/js-ir/runtime/coroutineInternalJS.kt

@@ -14,8 +14,9 @@ internal fun <T> getContinuation(): Continuation<T> { throw Exception("Implement
 // Do we really need this intrinsic in JS?
 
 @PublishedApi
+@Suppress("UNCHECKED_CAST")
 internal suspend fun <T> returnIfSuspended(@Suppress("UNUSED_PARAMETER") argument: Any?): T {
-    throw Exception("Implemented as intrinsic")
+    return argument as T
 }
 
 @PublishedApi