* regex.c (re_compile_pattern): * \1 .. \9 should be
  backreferences always.

* regex.c (re_match): backreferences corresponding to
  unclosed/unmatched parentheses should fail always.

* string.c (rb_str_cat): use rb_str_buf_cat() if possible. [new]

* string.c (rb_str_append): ditto.

* string.c (rb_str_buf_cat): remove unnecessary check (type,
  taint, modify) to gain performance.

* string.c (rb_str_buf_append): ditto.

* string.c (rb_str_buf_finish): removed.

* string.c (rb_str_buf_new): buffering string function. [new]

* string.c (rb_str_buf_append): ditto.

* string.c (rb_str_buf_cat): ditto.

* string.c (rb_str_buf_finish): ditto.

* time.c (make_time_t): local time adjustment revised.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1475 b2dd03c8-39d4-4d8f-98ff-823fe69b080e