[ruby-cvs:59250] ko1:r52099 (trunk): * import a github pull request

[ko1 at ruby-lang.org]

ko1	2015-10-10 15:34:24 +0900 (Sat, 10 Oct 2015)

  New Revision: 52099

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=52099

  Log:
    * import a github pull request
      https://github.com/ruby/ruby/pull/1050
      by Kazuho Oku <kazuho at 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.

  Modified files:
    trunk/ChangeLog
    trunk/gc.c
    trunk/string.c