Write kotlin metadata on class-files for coroutine state machines

Otherwise it breaks JPS assumptions, that leads to exceptions like:
Error:Kotlin: [Internal Error] java.lang.AssertionError: Couldn't load KotlinClass from /Users/jetbrains/IdeaProjects/KotlinPlaygroundBeta11/out/production/KotlinPlaygroundBeta11/Counter$both$1.class; it may happen because class doesn't have valid Kotlin annotations
    at org.jetbrains.kotlin.build.GeneratedJvmClass.<init>(generatedFiles.kt:36)
    at org.jetbrains.kotlin.jps.build.KotlinBuilder.getGeneratedFiles(KotlinBuilder.kt:469)
    at org.jetbrains.kotlin.jps.build.KotlinBuilder.doBuild(KotlinBuilder.kt:241)
    at org.jetbrains.kotlin.jps.build.KotlinBuilder.build(KotlinBuilder.kt:140)
...

jps-plugin/testData/incremental/pureKotlin/suspendWithStateMachine/Counter.kt

@@ -0,0 +1,10 @@
+package test
+
+class Counter {
+    suspend fun one() {}
+    suspend fun two() {}
+    suspend fun both() {
+        one()
+        two()
+    }
+}

jps-plugin/testData/incremental/pureKotlin/suspendWithStateMachine/build.log

@@ -0,0 +1,11 @@
+================ Step #1 =================
+
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/test/OtherKt.class
+End of files
+Compiling files:
+  src/other.kt
+End of files
+Exit code: OK
+------------------------------------------

jps-plugin/testData/incremental/pureKotlin/suspendWithStateMachine/other.kt

@@ -0,0 +1,4 @@
+package test
+
+fun dummyFunction() {
+}