[FIR] Relax intersection overrides visibility requirements for Java

Allow multiple bases with default
implementations as long as there's a
non-abstract symbol from a class.

Our rules for Kotlin are stricter than
those in Java.

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

@@ -5,13 +5,17 @@
 
 package org.jetbrains.kotlin.fir.backend.native
 
+import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.backend.native.interop.decodeObjCMethodAnnotation
 import org.jetbrains.kotlin.fir.declarations.FirCallableDeclaration
 import org.jetbrains.kotlin.fir.declarations.FirProperty
 import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
 import org.jetbrains.kotlin.fir.scopes.FirOverrideChecker
+import org.jetbrains.kotlin.fir.scopes.MemberWithBaseScope
 import org.jetbrains.kotlin.fir.scopes.impl.FirStandardOverrideChecker
+import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirRegularClassSymbol
 
 /**
  * The same code, as in this class also exists in [org.jetbrains.kotlin.ir.objcinterop.ObjCOverridabilityCondition]
@@ -30,6 +34,11 @@ class FirNativeOverrideChecker(private val session: FirSession) : FirOverrideChe
         // KT-57640: There's no necessity to implement platform-dependent overridability check for properties
         standardOverrideChecker.isOverriddenProperty(overrideCandidate, baseDeclaration)
 
+    override fun <D : FirCallableSymbol<*>> chooseIntersectionVisibility(
+        extractedOverrides: Collection<MemberWithBaseScope<D>>,
+        dispatchClassSymbol: FirRegularClassSymbol?,
+    ): Visibility = standardOverrideChecker.chooseIntersectionVisibility(extractedOverrides, dispatchClassSymbol)
+
     /**
      * mimics ObjCOverridabilityCondition.isOverridable
      */