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vm_backtrace.c: ignore ifunc frames

• vm_backtrace.c (rb_profile_frames): ignore ifunc frames as it
  did before. [ruby-core:72409] [Bug #11851]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53225 b2dd03c8-39d4-4d8f-98ff-823fe69b080e