FIR: handle SAM constructor properly in visibility checker

#KT-46074 Fixed

compiler/fir/analysis-tests/testData/resolve/samConstructors/kotlinSam.fir.txt

@@ -5,6 +5,12 @@ FILE: kotlinSam.kt
     }
     public final fun foo(m: R|MyRunnable|): R|kotlin/Unit| {
     }
+    private abstract interface PrivateRunnable : R|kotlin/Any| {
+        public abstract fun bar(x: R|kotlin/String|): R|kotlin/Boolean|
+
+    }
+    private final fun bar(pr: R|PrivateRunnable|): R|kotlin/Unit| {
+    }
     public final fun main(): R|kotlin/Unit| {
         R|/foo|(R|/MyRunnable|(<L> = MyRunnable@fun <anonymous>(x: R|kotlin/Int|): R|kotlin/Boolean| <inline=NoInline>  {
             ^ CMP(>, R|<local>/x|.R|kotlin/Int.compareTo|(Int(1)))
@@ -19,4 +25,8 @@ FILE: kotlinSam.kt
         }
 
         R|/foo|(R|/MyRunnable|(R|<local>/x|))
+        R|/bar|(R|/PrivateRunnable|(<L> = PrivateRunnable@fun <anonymous>(s: R|kotlin/String|): R|kotlin/Boolean| <inline=NoInline>  {
+            ^ CMP(>, R|<local>/s|.R|kotlin/String.length|.R|kotlin/Int.compareTo|(Int(0)))
+        }
+        ))
     }

compiler/fir/analysis-tests/testData/resolve/samConstructors/kotlinSam.kt

@@ -4,6 +4,12 @@ fun interface MyRunnable {
 
 fun foo(m: MyRunnable) {}
 
+private fun interface PrivateRunnable {
+    fun bar(x: String): Boolean
+}
+
+private fun bar(pr: PrivateRunnable) {}
+
 fun main() {
     foo(MyRunnable { x ->
         x > 1
@@ -14,4 +20,6 @@ fun main() {
     val x = { x: Int -> x > 1 }
 
     foo(MyRunnable(x))
+
+    bar(PrivateRunnable { s -> s.length > 0 })
 }

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/FirVisibilityChecker.kt

@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.resolve.calls.Candidate
+import org.jetbrains.kotlin.fir.resolve.calls.FirSyntheticFunctionSymbol
 import org.jetbrains.kotlin.fir.resolve.calls.ReceiverValue
 import org.jetbrains.kotlin.fir.resolve.firProvider
 import org.jetbrains.kotlin.fir.resolve.symbolProvider
@@ -77,6 +78,11 @@ abstract class FirVisibilityChecker : FirSessionComponent {
                     when {
                         ownerId == null -> {
                             val candidateFile = when (symbol) {
+                                is FirSyntheticFunctionSymbol -> {
+                                    // SAM case
+                                    val classId = ClassId(symbol.callableId.packageName, symbol.callableId.callableName)
+                                    provider.getFirClassifierContainerFile(classId)
+                                }
                                 is FirClassLikeSymbol<*> -> provider.getFirClassifierContainerFileIfAny(symbol)
                                 is FirCallableSymbol<*> -> provider.getFirCallableContainerFile(symbol)
                                 else -> null