Crash in C2 with 7u2b13

[Charles Oliver Nutter]

Got this report from a JRuby user, so I figured I'd toss it on this
list and see if I should report it (or if one of you want to look into
it directly):

http://jira.codehaus.org/browse/JRUBY-6297

It's crashing in one of the compiler threads in
ciMethod::resolve_invoke, as far as I can tell. I have no simple
reproduction at the moment :(

- Charlie