Show expect / actual for parameters & enum entries in drop-box

#KT-26957 Fixed

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

@@ -46,6 +46,9 @@ class KtClassBody : KtElementImplStub<KotlinPlaceHolderStub<KtClassBody>>, KtDec
     val properties: List<KtProperty>
         get() = getStubOrPsiChildrenAsList(KtStubElementTypes.PROPERTY)
 
+    val enumEntries: List<KtEnumEntry>
+        get() = getStubOrPsiChildrenAsList(KtStubElementTypes.ENUM_ENTRY).filterIsInstance<KtEnumEntry>()
+
     val allCompanionObjects: List<KtObjectDeclaration>
         get() = getStubOrPsiChildrenAsList(KtStubElementTypes.OBJECT_DECLARATION).filter { it.isCompanion() }