Classloading glitch in publicLookup.findConstructor?

[Charles Oliver Nutter]

We've had a number of reports of LinkageError-related problems with a
constructor handle acquired through publicLookup.

Here's the commit that fixed the problem, with a link to a PR explaining
the error:

https://github.com/jruby/jruby/commit/32926ac194c03f0e61c0121e9da0b0427cfa5869

It seems like the error indicates a class is getting loaded into the
bootstrap classloader during lookup when it should not, and as a result any
child classloaders that load it later on have a conflicting copy.

Thoughts? This is tested on a very recent Java 8.

- Charlie
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