compile.c: initialize LABEL fields
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54548 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
compile.c: initialize LABEL fields
compile_data_alloc does not clear the memory. [Bug #12082]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54548 b2dd03c8-39d4-4d8f-98ff-823fe69b080e