Report compile error for callable references to C/Obj-C variadics

#KT-36183 Fixed

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLoweringPhases.kt

@@ -243,7 +243,7 @@ internal val interopPhase = makeKonanFileLoweringPhase(
         ::InteropLowering,
         name = "Interop",
         description = "Interop lowering",
-        prerequisite = setOf(inlinePhase, localFunctionsPhase)
+        prerequisite = setOf(inlinePhase, localFunctionsPhase, callableReferencePhase)
 )
 
 internal val varargPhase = makeKonanFileLoweringPhase(

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/cgen/CBridgeGen.kt

@@ -42,6 +42,7 @@ import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.util.OperatorNameConventions
 import org.jetbrains.kotlin.backend.konan.getObjCMethodInfo
+import org.jetbrains.kotlin.backend.konan.lower.CallableReferenceLowering
 import org.jetbrains.kotlin.ir.descriptors.*
 
 internal interface KotlinStubs {
@@ -261,6 +262,10 @@ private fun <R> KotlinToCCallBuilder.handleArgumentForVarargParameter(
             } else {
                 stubs.throwCompilerError(initializer, "unexpected initializer")
             }
+        } else if (variable is IrValueParameter && CallableReferenceLowering.isLoweredCallableReference(variable)) {
+            val location = variable.parent // Parameter itself has incorrect location.
+            val kind = if (this.isObjCMethod) "Objective-C methods" else "C functions"
+            stubs.reportError(location, "callable references to variadic $kind are not supported")
         } else {
             stubs.throwCompilerError(variable, "unexpected value declaration")
         }

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/CallableReferenceLowering.kt

@@ -41,6 +41,11 @@ internal class CallableReferenceLowering(val context: Context): FileLoweringPass
 
     private object DECLARATION_ORIGIN_FUNCTION_REFERENCE_IMPL : IrDeclarationOriginImpl("FUNCTION_REFERENCE_IMPL")
 
+    companion object {
+        fun isLoweredCallableReference(declaration: IrDeclaration): Boolean =
+                declaration.origin == DECLARATION_ORIGIN_FUNCTION_REFERENCE_IMPL
+    }
+
     private val kTypeGenerator = KTypeGenerator(context)
 
     override fun lower(irFile: IrFile) {