Fix KotlinReflectionInternalError on encountering 'clone' in a class

`RuntimeTypeMapper.mapSignature` threw exception because the descriptor
for `clone` was created manually in CloneableClassScope and therefore it
didn't have a JVM signature as in deserialized descriptors, and wasn't
recognized as a Java method either.

 #KT-22923 Fixed

core/descriptors.jvm/src/org/jetbrains/kotlin/builtins/jvm/CloneableClassScope.kt

@@ -28,6 +28,6 @@ class CloneableClassScope(
     )
 
     companion object {
-        internal val CLONE_NAME = Name.identifier("clone")
+        val CLONE_NAME = Name.identifier("clone")
     }
 }