[ruby-cvs:73205] nagachika:r66105 (ruby_2_5): merge revision(s) 65956:

[nagachika at ruby-lang.org]

nagachika	2018-11-30 20:59:43 +0900 (Fri, 30 Nov 2018)

  New Revision: 66105

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66105

  Log:
    merge revision(s) 65956:
    
    fix r65954; Keep tainty

  Modified directories:
    branches/ruby_2_5/
  Modified files:
    branches/ruby_2_5/string.c
    branches/ruby_2_5/version.h