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merge revision(s) 55554: [Backport #12537]

    * test/fiddle/test_pointer.rb (test_to_str, test_to_s, test_aref_aset):
      Attempt to use independent strings for destructive tests that
      directly modify values on memory by using Fiddle::Pointer.
      [Bug #12537] [ruby-dev:49700]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@55989 b2dd03c8-39d4-4d8f-98ff-823fe69b080e