* string.c (STR_ENC_GET): defined. same as rb_enc_get without

  enc_capable.
  (coderange_scan): ASCII-8BIT test refined.
  (rb_enc_cr_str_buf_cat): new internal function to accumulate
  strings with encoding.
  (rb_enc_str_buf_cat): use rb_enc_cr_str_buf_cat.
  (rb_str_buf_append): ditto
  (str_gsub): use rb_str_buf_append.
  (rb_str_hash): use ENCODING_GET.
  (rb_str_comparable): ditto.
  (rb_str_cmp): compare encoding index, not rb_encoding address.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14938 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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