Cleanup RC deprecations in compiler and plugin.

compiler/backend/src/org/jetbrains/kotlin/codegen/ArgumentGenerator.kt

@@ -40,7 +40,7 @@ abstract class ArgumentGenerator {
 
         val actualArgsWithDeclIndex = actualArgs.filter { it !is DefaultValueArgument }.map {
             ArgumentAndDeclIndex(it, arg2Index[it]!!)
-        }.toArrayList()
+        }.toMutableList()
 
         valueArgumentsByIndex.withIndex().forEach {
             if (it.value is DefaultValueArgument) {

compiler/backend/src/org/jetbrains/kotlin/codegen/context/DefaultImplsClassContext.kt

@@ -38,7 +38,7 @@ class DefaultImplsClassContext(
     override fun getAccessors(): Collection<AccessorForCallableDescriptor<*>> {
         val accessors = super.getAccessors()
         val alreadyExistKeys = accessors.map ({ Pair(it.calleeDescriptor, it.superCallTarget) })
-        val filtered = interfaceContext.accessors.toMapBy({ Pair(it.calleeDescriptor, it.superCallTarget) }, { it }) - alreadyExistKeys
+        val filtered = interfaceContext.accessors.associateByTo(linkedMapOf()) { Pair(it.calleeDescriptor, it.superCallTarget) }.apply { keys -= alreadyExistKeys }
         return accessors + filtered.values
     }
 }