* addr2line.c (fill_lines): skip if path is NULL.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45409 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* addr2line.c (rb_dump_backtrace_with_lines): a function to get must
  be a function in the main executable, whose absolute path is not
  available by dladdr, and ruby get it by /proc/self/exe on Linux.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45410 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-03-26

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45411 b2dd03c8-39d4-4d8f-98ff-823fe69b080e