IR: make IrSymbol.isPublicApi an extension

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrSymbol.kt

@@ -33,11 +33,11 @@ interface IrSymbol {
     val isBound: Boolean
 
     val signature: IdSignature?
-
-    val isPublicApi: Boolean
-        get() = signature != null
 }
 
+val IrSymbol.isPublicApi: Boolean
+    get() = signature != null
+
 interface IrBindableSymbol<out D : DeclarationDescriptor, B : IrSymbolOwner> : IrSymbol {
     override val owner: B
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/impl/DescriptorlessExternalPackageFragmentSymbol.kt

@@ -19,9 +19,6 @@ class DescriptorlessExternalPackageFragmentSymbol : IrExternalPackageFragmentSym
     private var _owner: IrExternalPackageFragment? = null
     override val owner get() = _owner!!
 
-    override val isPublicApi: Boolean
-        get() = TODO("Not yet implemented")
-
     override val signature: IdSignature?
         get() = TODO("Not yet implemented")
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/irTypePredicates.kt

@@ -98,8 +98,8 @@ fun IrType.isCollection(): Boolean = isNotNullClassType(IdSignatureValues.collec
 fun IrType.isNothing(): Boolean = isNotNullClassType(IdSignatureValues.nothing)
 
 fun IrType.isPrimitiveType(hasQuestionMark: Boolean = false): Boolean =
-        (this is IrSimpleType && hasQuestionMark == this.hasQuestionMark) &&
-                classOrNull?.takeIf(IrClassSymbol::isPublicApi)?.signature in idSignatureToPrimitiveType
+    (this is IrSimpleType && hasQuestionMark == this.hasQuestionMark) &&
+            classOrNull?.signature in idSignatureToPrimitiveType
 
 fun IrType.isNullablePrimitiveType(): Boolean = isPrimitiveType(true)
 

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

@@ -1112,8 +1112,8 @@ fun SymbolTable.noUnboundLeft(message: String) {
     val unbound = this.allUnbound
     assert(unbound.isEmpty()) {
         "$message\n" +
-                unbound.map {
-                    "$it ${if (it.isPublicApi) it.signature.toString() else "NON-PUBLIC API $it"}"
-                }.joinToString("\n")
+                unbound.joinToString("\n") {
+                    "$it ${it.signature?.toString() ?: "NON-PUBLIC API $it"}"
+                }
     }
 }