Ruby » Ruby master

merge revision(s) 54542,54548: [Backport #12082]

    * compile.c (iseq_optimize): disable tail call optimization in
      rescued, rescue, and ensure blocks.
      [ruby-core:73871] [Bug #12082]

    * compile.c (new_label_body): initialize bit fields, since
      compile_data_alloc does not clear the memory.  [Bug #12082]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e