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
merge revision(s) 54542,54548: [Backport #12082]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e