* addr2line.c (fill_lines): check shdr[i].sh_type because even if
  .symtab section exists, the section's type can be SHT_NOBITS and
  actual data doesn't exist in the file. [Bug #9654]
  revert r45441.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45445 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: invert flag

* string.c (str_gsub): invert and rename `str_replace` flag as
  `need_backref`.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45446 b2dd03c8-39d4-4d8f-98ff-823fe69b080e