[NI] Propagate class to extend inference through resolution context

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/ExternalComponents.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2000-2018 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.resolve.calls.components
@@ -50,4 +39,6 @@ interface KotlinResolutionCallbacks {
     fun createReceiverWithSmartCastInfo(resolvedAtom: ResolvedCallAtom): ReceiverValueWithSmartCastInfo?
 
     fun isCompileTimeConstant(resolvedAtom: ResolvedCallAtom, expectedType: UnwrappedType): Boolean
+
+    val inferenceSession: InferenceSession
 }

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/KotlinCallCompleter.kt

@@ -163,4 +163,10 @@ class KotlinCallCompleter(
             systemStorage
         )
     }
+}
+
+interface InferenceSession {
+    companion object {
+        val default = object : InferenceSession {}
+    }
 }