* vm_backtrace.c (rb_profile_frame_classpath): do not use rb_inspect
  directly, since it might have a custom implementation or show ivars.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43443 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Merge remote-tracking branch 'origin/trunk' into 2.1