Backporting WL#3759 Optimize identifier conversion in client-server protocol

This patch provides performance improvements:
- send_fields() when character_set_results = latin1
  is now about twice faster for column/table/database
  names, consisting on ASCII characters.

Changes:

- Protocol doesn't use "convert" temporary buffer anymore,
  and converts strings directly to "packet".

- General conversion optimization: quick conversion
  of ASCII strings was added.

modified files:

include/m_ctype.h
- Adding a new flag.
- Adding a new function prototype

libmysqld/lib_sql.cc
- Adding quick conversion method for embedded library:
  conversion is now done directly to result buffer,
  without using a temporary buffer.

mysys/charset.c
- Mark all dynamic ucs2 character sets as non-ASCII
- Mark some dymamic 7bit and 8bit charsets as non-ASCII
  (for example swe7 is not fully ASCII compatible).

sql/protocol.cc
- Adding quick method to convert a string directly
  into protocol buffer, without using a temporary buffer.

sql/protocol.h
- Adding a new method prototype

sql/sql_string.cc
  Optimization for conversion between two ASCII-compatible charsets:
- quickly convert ASCII strings,
  switch to mc_wc->wc_mb method only when a non-ASCII character is met.
- copy four ASCII characters at once on i386

strings/conf_to_src.c
- Marking non-ASCII character sets with a flag.

strings/ctype-extra.c
- Regenerating ctype-extra.c by running "conf_to_src".

strings/ctype-uca.c
- Marking UCS2 character set as non-ASCII.

strings/ctype-ucs2.c
- Marking UCS2 character set as non-ASCII.

strings/ctype.c
- A new function to detect if a 7bit or 8bit character set
  is ascii compatible.

strings/ctype-extra.c

@@ -6,7 +6,7 @@
     ./conf_to_src ../sql/share/charsets/ > FILE
 */
 
-/* Copyright (C) 2000-2007 MySQL AB
+/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -6804,7 +6804,7 @@ CHARSET_INFO compiled_charsets[] = {
 #ifdef HAVE_CHARSET_swe7
 {
   10,0,0,
-  MY_CS_COMPILED|MY_CS_PRIMARY,
+  MY_CS_COMPILED|MY_CS_PRIMARY|MY_CS_NONASCII,
   "swe7",                     /* cset name     */
   "swe7_swedish_ci",                     /* coll name     */
   "",                       /* comment       */
@@ -8454,7 +8454,7 @@ CHARSET_INFO compiled_charsets[] = {
 #ifdef HAVE_CHARSET_swe7
 {
   82,0,0,
-  MY_CS_COMPILED|MY_CS_BINSORT,
+  MY_CS_COMPILED|MY_CS_BINSORT|MY_CS_NONASCII,
   "swe7",                     /* cset name     */
   "swe7_bin",                     /* coll name     */
   "",                       /* comment       */
@@ -8550,72 +8550,6 @@ CHARSET_INFO compiled_charsets[] = {
 }
 ,
 #endif
-#ifdef HAVE_CHARSET_geostd8
-{
-  92,0,0,
-  MY_CS_COMPILED|MY_CS_PRIMARY,
-  "geostd8",                     /* cset name     */
-  "geostd8_general_ci",                     /* coll name     */
-  "",                       /* comment       */
-  NULL,                       /* tailoring     */
-  ctype_geostd8_general_ci,                   /* ctype         */
-  to_lower_geostd8_general_ci,                /* lower         */
-  to_upper_geostd8_general_ci,                /* upper         */
-  sort_order_geostd8_general_ci,            /* sort_order    */
-  NULL,                       /* contractions  */
-  NULL,                       /* sort_order_big*/
-  to_uni_geostd8_general_ci,                  /* to_uni        */
-  NULL,                       /* from_uni      */
-  my_unicase_default,         /* caseinfo      */
-  NULL,                       /* state map     */
-  NULL,                       /* ident map     */
-  1,                          /* strxfrm_multiply*/
-  1,                          /* caseup_multiply*/
-  1,                          /* casedn_multiply*/
-  1,                          /* mbminlen      */
-  1,                          /* mbmaxlen      */
-  0,                          /* min_sort_char */
-  255,                        /* max_sort_char */
-  ' ',                        /* pad_char      */
-  0,                          /* escape_with_backslash_is_dangerous */
-  &my_charset_8bit_handler,
-  &my_collation_8bit_simple_ci_handler,
-}
-,
-#endif
-#ifdef HAVE_CHARSET_geostd8
-{
-  93,0,0,
-  MY_CS_COMPILED|MY_CS_BINSORT,
-  "geostd8",                     /* cset name     */
-  "geostd8_bin",                     /* coll name     */
-  "",                       /* comment       */
-  NULL,                       /* tailoring     */
-  ctype_geostd8_bin,                   /* ctype         */
-  to_lower_geostd8_bin,                /* lower         */
-  to_upper_geostd8_bin,                /* upper         */
-  NULL,                     /* sort_order    */
-  NULL,                       /* contractions  */
-  NULL,                       /* sort_order_big*/
-  to_uni_geostd8_bin,                  /* to_uni        */
-  NULL,                       /* from_uni      */
-  my_unicase_default,         /* caseinfo      */
-  NULL,                       /* state map     */
-  NULL,                       /* ident map     */
-  1,                          /* strxfrm_multiply*/
-  1,                          /* caseup_multiply*/
-  1,                          /* casedn_multiply*/
-  1,                          /* mbminlen      */
-  1,                          /* mbmaxlen      */
-  0,                          /* min_sort_char */
-  255,                        /* max_sort_char */
-  ' ',                        /* pad_char      */
-  0,                          /* escape_with_backslash_is_dangerous */
-  &my_charset_8bit_handler,
-  &my_collation_8bit_bin_handler,
-}
-,
-#endif
 #ifdef HAVE_CHARSET_latin1
 {
   94,0,0,