[K/JS] Process JS-specific returnable blocks before the state machine building

^KT-60785 Fixed
^KT-63207 Fixed

compiler/testData/codegen/box/coroutines/intrinsicSemantics/intercepted.kt

@@ -1,6 +1,5 @@
 // WITH_STDLIB
 // WITH_COROUTINES
-// IGNORE_BACKEND: JS_IR, JS_IR_ES6
 import helpers.*
 import kotlin.coroutines.*
 import kotlin.coroutines.intrinsics.*

compiler/testData/codegen/box/coroutines/intrinsicSemantics/releaseIntercepted.kt

@@ -1,5 +1,4 @@
 // WITH_STDLIB
-// IGNORE_BACKEND: JS_IR, JS_IR_ES6
 import kotlin.coroutines.*
 import kotlin.coroutines.intrinsics.*