[PATCH] xml.el (xml-parse-string): Use `skip-chars-forward'.

[Mario Lang]

Hi.

        * xml.el (xml-parse-string): Use `skip-chars-forward' instead
        of `search-forward' followed by `backward-char'.

This change gives me a significant speedup of XML parsing with xml.el:

Current HEAD:
Function Name                    Call Count  Elapsed Time  Average Time
xml-parse-region                 3           946.16447599  315.38815866
xml-parse-string                 190278      322.59048899  0.0016953640

With this change applied:
Function Name                    Call Count  Elapsed Time  Average Time
xml-parse-region                 3           637.16046399  212.38682133
xml-parse-string                 190278      7.1974619999  3.782...e-05

Yes, I didn't believe it either on first sight, so I repeated my test
a few times.  Its always the same, XML parsing is 30% faster with
this small patch applied!

--- a/lisp/xml.el
+++ b/lisp/xml.el
@@ -494,9 +494,7 @@ Returns one of:
 (defun xml-parse-string ()
   "Parse the next whatever.  Could be a string, or an element."
   (let* ((pos (point))
-        (string (progn (if (search-forward "<" nil t)
-                           (forward-char -1)
-                         (goto-char (point-max)))
+        (string (progn (skip-chars-forward "^<")
                        (buffer-substring-no-properties pos (point)))))
     ;; Clean up the string.  As per XML specifications, the XML
     ;; processor should always pass the whole string to the

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