(rb_enc_str_asciicompat_p): defined.
* re.c (rb_reg_initialize_str): use rb_enc_str_asciionly_p.
(rb_reg_quote): return ascii-8bit string if the argument is
ascii-only to generate encoding generic regexp if possible.
(rb_reg_s_union): fix encoding handling. [ruby-dev:32094]
* string.c (rb_enc_str_asciionly_p): defined.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14013 b2dd03c8-39d4-4d8f-98ff-823fe69b080e