[ruby-cvs:61484] nagachika:r54322 (ruby_2_2): merge revision(s) 53943: [Backport #11969]

[nagachika at ruby-lang.org]

nagachika	2016-03-29 00:07:06 +0900 (Tue, 29 Mar 2016)

  New Revision: 54322

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=54322

  Log:
    merge revision(s) 53943: [Backport #11969]
    
    * lib/irb.rb: avoid to needless truncation when using back_trace_limit option.
      [fix GH-1205][ruby-core:72773][Bug #11969]

  Modified directories:
    branches/ruby_2_2/
  Modified files:
    branches/ruby_2_2/ChangeLog
    branches/ruby_2_2/lib/irb.rb
    branches/ruby_2_2/version.h