Refactoring. Some simplifications in OverloadingConflictResolver.

core/descriptors/src/org/jetbrains/kotlin/resolve/DescriptorUtils.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 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.
@@ -259,4 +259,8 @@ fun ClassDescriptor.getConstructorByParams(params: List<KotlinType>): Constructo
 
 // TODO: inline and remove as soon as all usage sies are converted to kotlin
 fun getConstructorByParamsMap(classDescriptor: ClassDescriptor, params: List<Pair<Name, KotlinType>>): ConstructorDescriptor? =
-        classDescriptor.getConstructorByParams(params.map { it.second })
+        classDescriptor.getConstructorByParams(params.map { it.second })
+
+
+fun CallableDescriptor.varargParameterPosition() =
+        valueParameters.indexOfFirst { it.varargElementType != null }