[FIR] Remove symbol.fir from FirNativeObjCOverrideInitChecker

compiler/fir/native/src/org/jetbrains/kotlin/fir/backend/native/FirNativeOverrideChecker.kt

@@ -48,8 +48,8 @@ class FirNativeOverrideChecker(private val session: FirSession) : FirOverrideChe
         if (this.name != baseDeclaration.name) {
             return null
         }
-        val superInfo = baseDeclaration.decodeObjCMethodAnnotation(session) ?: return null
-        val subInfo = decodeObjCMethodAnnotation(session)
+        val superInfo = baseDeclaration.symbol.decodeObjCMethodAnnotation(session) ?: return null
+        val subInfo = symbol.decodeObjCMethodAnnotation(session)
         return if (subInfo != null) {
             // Overriding Objective-C method by Objective-C method in interop stubs.
             // Don't even check method signatures, so this check is weaker than the standard one

compiler/fir/native/src/org/jetbrains/kotlin/fir/backend/native/interop/FirObjCInterop.kt

@@ -77,9 +77,6 @@ internal fun List<FirAnnotation>.decodeObjCMethodAnnotation(session: FirSession)
         )
     }
 
-internal fun FirFunction.decodeObjCMethodAnnotation(session: FirSession): ObjCMethodInfo? =
-    annotations.decodeObjCMethodAnnotation(session)
-
 internal fun FirFunctionSymbol<*>.decodeObjCMethodAnnotation(session: FirSession): ObjCMethodInfo? =
     annotations.decodeObjCMethodAnnotation(session)