* import a github pull request

  https://github.com/ruby/ruby/pull/1050
  by Kazuho Oku <kazuho@natadeco.co>.
  This pull request has the following commits.
* gc.c: reduce # of args to 6 (max. of register args on x86-64) so
  that the `newobj_of_slowpass` can be called via TCO.
* gc.c (newobj_of), string.c (str_duplicate): for performance,
  the hot functions must be inlined.
* gc.c: for performance, preceding arguments of `.*newobj_of.*`
  must be same, so that the arg registers can be reused in case of
  TCO.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52099 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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