[IR] Add API into IdSignature to filter inaccessible function in IC

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

@@ -47,6 +47,9 @@ sealed class IdSignature {
 
     open val isLocal: Boolean get() = !isPubliclyVisible
 
+    // TODO: this API is a bit hacky, consider to act somehow else
+    open val visibleCrossFile: Boolean get() = true
+
     override fun toString(): String =
         "${if (isLocal) "local " else ""}${render()}"
 
@@ -107,6 +110,9 @@ sealed class IdSignature {
         override val isLocal: Boolean
             get() = inner.isLocal
 
+        override val visibleCrossFile: Boolean
+            get() = container.visibleCrossFile
+
         override fun topLevelSignature(): IdSignature {
             return if (container is FileSignature)
                 CompositeSignature(container, inner.topLevelSignature())
@@ -169,6 +175,9 @@ sealed class IdSignature {
         override val isPubliclyVisible: Boolean
             get() = true
 
+        override val visibleCrossFile: Boolean
+            get() = false
+
         override fun isPackageSignature(): Boolean = true
 
         override fun topLevelSignature(): IdSignature = this
@@ -294,6 +303,9 @@ sealed class IdSignature {
 
         override fun packageFqName(): FqName = container.packageFqName()
 
+        override val visibleCrossFile: Boolean
+            get() = false
+
         override fun topLevelSignature(): IdSignature {
             val topLevelContainer = container.topLevelSignature()
             if (topLevelContainer === container) {
@@ -324,6 +336,9 @@ sealed class IdSignature {
 
         override val isPubliclyVisible: Boolean get() = false
 
+        override val visibleCrossFile: Boolean
+            get() = false
+
         override val hasTopLevel: Boolean get() = false
 
         override fun topLevelSignature(): IdSignature = error("Is not supported for Local ID")
@@ -345,6 +360,9 @@ sealed class IdSignature {
 
         override val hasTopLevel: Boolean get() = true
 
+        override val visibleCrossFile: Boolean
+            get() = original.visibleCrossFile
+
         override fun topLevelSignature(): IdSignature = this
 
         override fun nearestPublicSig(): IdSignature = this