Clarify Visibility.isVisible contract for null as receiverValue

See comment

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/JavaTypeAccessibilityChecker.kt

@@ -74,7 +74,7 @@ class JavaTypeAccessibilityChecker : AdditionalTypeChecker {
             if (visitedTypeConstructors.contains(typeConstructor)) return
             visitedTypeConstructors.add(typeConstructor)
 
-            if (typeConstructor is JavaClassDescriptor && !Visibilities.isVisibleWithIrrelevantReceiver(typeConstructor, scopeOwner)) {
+            if (typeConstructor is JavaClassDescriptor && !Visibilities.isVisibleIgnoringReceiver(typeConstructor, scopeOwner)) {
                 inaccessibleTypes.add(type)
             }
             for (typeProjection in type.arguments) {

compiler/frontend.java/src/org/jetbrains/kotlin/synthetic/syntheticExtensionsUtils.kt

@@ -36,7 +36,7 @@ fun syntheticExtensionVisibility(originalDescriptor: DeclarationDescriptorWithVi
 
         else -> object : Visibility(originalVisibility.name, originalVisibility.isPublicAPI) {
             override fun isVisible(receiver: ReceiverValue?, what: DeclarationDescriptorWithVisibility, from: DeclarationDescriptor)
-                    = originalVisibility.isVisible(receiver, originalDescriptor, from)
+                    = originalVisibility.isVisible(Visibilities.ALWAYS_SUITABLE_RECEIVER, originalDescriptor, from)
 
             override fun mustCheckInImports()
                     = throw UnsupportedOperationException("Should never be called for this visibility")