git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39305 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
the frame is IFUNC. But return a ruby-level binding to keep
compatibility.
This patch fix degradation introduced from r39067.
[Bug #7774] [ruby-dev:46960]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39305 b2dd03c8-39d4-4d8f-98ff-823fe69b080e