Rename isImpl to isActual in descriptors

idea/src/org/jetbrains/kotlin/idea/highlighter/markers/DeclaredHeaderMarker.kt

@@ -72,7 +72,7 @@ internal fun DeclarationDescriptor.liftToHeader(): DeclarationDescriptor? {
     if (this is MemberDescriptor) {
         return when {
             isExpect -> this
-            isImpl -> headerDescriptor()
+            isActual -> headerDescriptor()
             else -> null
         }
     }

idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeSignatureHandler.kt

@@ -165,7 +165,7 @@ class KotlinChangeSignatureHandler : ChangeSignatureHandler {
             if (!CommonRefactoringUtil.checkReadOnlyStatus(project, element)) return null
 
             var descriptor = getDescriptor(bindingContext, element)
-            if (descriptor is MemberDescriptor && descriptor.isImpl) {
+            if (descriptor is MemberDescriptor && descriptor.isActual) {
                 descriptor = descriptor.headerDescriptor() ?: descriptor
             }
 

idea/src/org/jetbrains/kotlin/idea/refactoring/rename/AutomaticOverloadsRenamer.kt

@@ -68,7 +68,7 @@ private fun KtNamedFunction.getOverloads(): Collection<FunctionDescriptor> {
     val scope = getResolutionScope(context, resolutionFacade)
     val extensionReceiverClass = descriptor.extensionReceiverParameter?.type?.constructor?.declarationDescriptor as? ClassDescriptor
 
-    if (descriptor.isImpl && descriptor.headerDescriptor() != null) return emptyList()
+    if (descriptor.isActual && descriptor.headerDescriptor() != null) return emptyList()
 
     val result = LinkedHashSet<FunctionDescriptor>()
     result += scope.getAllAccessibleFunctions(name)