New evaluator that doesn't depend on the 'extract function' refactoring (KT-28192, KT-25220, KT-25222, KT-21650)

compiler/psi/src/org/jetbrains/kotlin/psi/KtCodeFragment.kt

@@ -199,3 +199,5 @@ abstract class KtCodeFragment(
         private val LOG = Logger.getInstance(KtCodeFragment::class.java)
     }
 }
+
+var KtCodeFragment.externalDescriptors: List<DeclarationDescriptor>? by CopyablePsiUserDataProperty(Key.create("EXTERNAL_DESCRIPTORS"))

compiler/psi/src/org/jetbrains/kotlin/psi/psiUtil/ktPsiUtil.kt

@@ -153,6 +153,9 @@ fun KtExpression.getQualifiedExpressionForReceiverOrThis(): KtExpression {
 fun KtExpression.isDotReceiver(): Boolean =
     (parent as? KtDotQualifiedExpression)?.receiverExpression == this
 
+fun KtExpression.isDotSelector(): Boolean =
+    (parent as? KtDotQualifiedExpression)?.selectorExpression == this
+
 fun KtExpression.getPossiblyQualifiedCallExpression(): KtCallExpression? =
     ((this as? KtQualifiedExpression)?.selectorExpression ?: this) as? KtCallExpression