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A backtrace object in an exception had never supported marshalling correctly: `Marshal.load(Marshal.dump(exc)).backtrace_locations` dumped core. An Exception object has two hidden instance varibles for backtrace data: one is "bt", which has an Array of Strings, and the other is "bt_locations", which has an Array of Thread::Backtrace::Locations. However, Exception's dump outputs data so that the two variables are the same Array of Strings. Thus, "bt_locations" had a wrong-type object. For the compatibility, it is difficult to change the dump format. This changeset fixes the issue by ignoring data for "bt_locations" at the loading phase if "bt_locations" refers to the same object as "bt". Future work: Exception's dump should output "bt_locations" appropriately. https://bugs.ruby-lang.org/issues/17150