Added a comment for separate treatment of properties in IrDeserializer interface.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/SymbolTable.kt

@@ -34,6 +34,12 @@ import org.jetbrains.kotlin.ir.visitors.acceptVoid
 
 interface IrDeserializer {
     fun findDeserializedDeclaration(symbol: IrSymbol): IrDeclaration?
+    // We need a separate method for properties, because properties
+    // are treated differently in the SymbolTable.
+    // See SymbolTable.propertyTable and SymbolTable.referenceProperty.
+    // There was an attempt to solve this asymmetry in the symbol table
+    // using property symbols, but it was not successful.
+    // For now we have to live with a special treatment of properties.
     fun findDeserializedDeclaration(propertyDescriptor: PropertyDescriptor): IrProperty?
     fun declareForwardDeclarations()
 }
@@ -498,4 +504,4 @@ inline fun <T, D: DeclarationDescriptor> SymbolTable.withScope(owner: D, block:
     val result = block(owner)
     leaveScope(owner)
     return result
-}
+}