Update ChangeLog.

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+2012-01-18  Alan Mackenzie  <acm@muc.de>
+
+       Eliminate sluggishness and hangs in fontification of "semicolon
+       deserts".
+
+       * progmodes/cc-engine.el (c-state-nonlit-pos-interval): change
+       value 10000 -> 3000.
+       (c-state-safe-place): Reformulate so it doesn't stack up an
+       infinite number of wrong entries in c-state-nonlit-pos-cache.
+       (c-determine-limit-get-base, c-determine-limit): New functions to
+       determine backward search limits disregarding literals.
+       (c-find-decl-spots): Amend commenting.
+       (c-cheap-inside-bracelist-p): New function which detects "={".
+
+       * progmodes/cc-fonts.el
+       (c-make-font-lock-BO-decl-search-function): Give a limit to a
+       backward search.
+       (c-font-lock-declarations): Fix an occurrence of point being
+       undefined.  Check additionally for point being in a bracelist or
+       near a macro invocation without a semicolon so as to avoid a
+       fruitless time consuming search for a declarator.  Give a more
+       precise search limit for declarators using the new
+       c-determine-limit.
+
 2012-01-18  Glenn Morris  <rgm@gnu.org>
 
        * files.el (auto-mode-alist, inhibit-first-line-modes-regexps)