[ruby-core:91232] [Ruby trunk Bug#15558] Should Exception#exception copy the backtrace?

Issue #15558 has been reported by Eregon (Benoit Daloze).

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Bug #15558: Should Exception#exception copy the backtrace?
https://bugs.ruby-lang.org/issues/15558

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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Currently it does not on MRI:
```
ruby -e 'begin raise "foo"; rescue => e; c=e.exception "bar"; p c.backtrace; end'
nil
```

But it does on JRuby 9.2.5.0 and TruffleRuby 1.0.0-rc11:
```
truffleruby -e 'begin raise "foo"; rescue => e; c=e.exception "bar"; p e.backtrace; end'
["-e:1:in `<main>'"]
```

This means in some cases, code needs about this difference such as in
https://github.com/asciidoctor/asciidoctor/blob/41da20a47a8da96966ef3ec1c2f509e07e7920e3/lib/asciidoctor.rb#L1322-L1338
More context in:
https://github.com/oracle/truffleruby/issues/1542#issuecomment-456850066



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