Ruby

numeric.c: fix up r55891

• numeric.c (num_funcall1): check recursion by inverse pair, to
  fix fake infinite recursion. [ruby-core:77713] [Bug #12864]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56474 b2dd03c8-39d4-4d8f-98ff-823fe69b080e