Move coroutines to kotlin.coroutines package: compiler

Generate continuation type as kotlin.coroutines.Continuaion. This code will
fail at runtime since there is no stdlib backing this change yet.
However, in order to generate compatible stdlib we need a compiler, which
generates continuation type as kotlin.coroutines.Continuation.
Thus, firstly we support the change in the compiler, make it bootstrap
compiler and only then change stdlib and tests accordingly.
 #KT-23362

compiler/util/src/org/jetbrains/kotlin/config/CoroutineLanguageVersionSettingsUtil.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.config
+
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.resolve.DescriptorUtils
+
+fun LanguageVersionSettings.coroutinesPackageFqName(): FqName {
+    return coroutinesPackageFqName(supportsFeature(LanguageFeature.ReleaseCoroutines))
+}
+
+private fun coroutinesPackageFqName(isReleaseCoroutines: Boolean): FqName {
+    return if (isReleaseCoroutines)
+        DescriptorUtils.COROUTINES_PACKAGE_FQ_NAME_RELEASE
+    else
+        DescriptorUtils.COROUTINES_PACKAGE_FQ_NAME_EXPERIMENTAL
+}
+
+fun LanguageVersionSettings.coroutinesIntrinsicsPackageFqName() =
+    coroutinesPackageFqName().child(Name.identifier("intrinsics"))
+
+fun LanguageVersionSettings.continuationInterfaceFqName() =
+    coroutinesPackageFqName().child(Name.identifier("Continuation"))
+
+fun LanguageVersionSettings.restrictsSuspensionFqName() =
+    coroutinesPackageFqName().child(Name.identifier("RestrictsSuspension"))
+
+fun FqName.isBuiltInCoroutineContext(languageVersionSettings: LanguageVersionSettings) =
+    if (languageVersionSettings.supportsFeature(LanguageFeature.ReleaseCoroutines))
+        this == DescriptorUtils.COROUTINES_PACKAGE_FQ_NAME_RELEASE.child(Name.identifier("coroutineContext"))
+    else
+        this == DescriptorUtils.COROUTINES_PACKAGE_FQ_NAME_EXPERIMENTAL.child(Name.identifier("coroutineContext")) ||
+                this == DescriptorUtils.COROUTINES_INTRINSICS_PACKAGE_FQ_NAME_EXPERIMENTAL.child(Name.identifier("coroutineContext"))

compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the license/LICENSE.txt file.
  */
 
@@ -68,6 +68,7 @@ enum class LanguageFeature(
     InlineClasses(KOTLIN_1_3),
     ProhibitVisibilityOfNestedClassifiersFromSupertypesOfCompanion(KOTLIN_1_3),
     ProhibitNonConstValuesAsVarargsInAnnotations(KOTLIN_1_3),
+    ReleaseCoroutines(KOTLIN_1_3),
     ReadDeserializedContracts(KOTLIN_1_3),
     UseReturnsEffect(KOTLIN_1_3),
     UseCallsInPlaceEffect(KOTLIN_1_3),