Deprecate IrDeclaration.descriptor and IrSymbol.descriptor

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrDeclaration.kt

@@ -33,7 +33,9 @@ interface IrMetadataSourceOwner : IrElement {
 }
 
 interface IrDeclaration : IrStatement, IrMutableAnnotationContainer, IrMetadataSourceOwner {
+    @Deprecated("Please use IR declaration properties and not its descriptor properties")
     val descriptor: DeclarationDescriptor
+
     var origin: IrDeclarationOrigin
 
     var parent: IrDeclarationParent

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrSymbol.kt

@@ -27,7 +27,10 @@ import org.jetbrains.kotlin.types.model.TypeParameterMarker
 
 interface IrSymbol {
     val owner: IrSymbolOwner
+
+    @Deprecated("Please use IR declaration properties and not its descriptor properties")
     val descriptor: DeclarationDescriptor
+
     val isBound: Boolean
 
     val signature: IdSignature