Move coroutines to kotlin.coroutines package: tests

Introduce COMMON_COROUTINES_TEST directive.
Every test with this directive is run twice: one time with
language version 1.2 and kotlin.coroutines.experimental package
and the other time with language version 1.3 and kotlin.coroutines
package. Each run is a separate method: with suffixes _1_2 and _1_3
respectively.
However, since codegen of release coroutines is not supported in JS
backend, we generate only one method: with suffix _1_2.
 #KT-23362

compiler/testData/codegen/boxInline/suspend/stateMachine/innerObjectInsideInnerObject.kt

@@ -1,4 +1,5 @@
 // FILE: inlined.kt
+// COMMON_COROUTINES_TEST
 // WITH_RUNTIME
 // NO_CHECK_LAMBDA_INLINING
 
@@ -21,9 +22,10 @@ suspend inline fun crossinlineMe(crossinline c: suspend () -> Unit) {
 }
 
 // FILE: inlineSite.kt
+// COMMON_COROUTINES_TEST
 
-import kotlin.coroutines.experimental.*
-import kotlin.coroutines.experimental.intrinsics.*
+import COROUTINES_PACKAGE.*
+import COROUTINES_PACKAGE.intrinsics.*
 
 fun builder(c: suspend () -> Unit) {
     c.startCoroutine(object: Continuation<Unit> {