[wwwdocs] Fix up three broken citeseers links in projects/cfg.html

[wwwdocs] Fix up three broken citeseers links in projects/cfg.html

[Gerald Pfeifer]

For whatever reason citeseer no longer accepts those shorter and nicer
references, so I dug out the full fledged ones.

Installed.

Gerald

Index: cfg.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/projects/cfg.html,v
retrieving revision 1.17
diff -u -r1.17 cfg.html
--- cfg.html	25 Jan 2009 17:03:29 -0000	1.17
+++ cfg.html	6 Feb 2011 01:59:02 -0000
@@ -450,7 +450,7 @@
 <dl>
 <dt><a name="1">[1]</a></dt>
 
-<dd><a href="http://citeseer.ist.psu.edu/ball93branch.html">Branch
+<dd><a href="http://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.43.6404">Branch
 Prediction for Free; Ball and Larus; PLDI '93.</a></dd>
 
 <dt><a name="2">[2]</a></dt>
@@ -488,14 +488,15 @@
 
 <dt><a name="7">[7]</a></dt>
 
-<dd><a href="http://citeseer.ist.psu.edu/chang91using.html">Using
+<dd><a
+href="http://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.14.4115">Using
 Profile Information to Assist Classic Code Optimizations; Pohua P.
 Chang, Scott A. Mahlke, and Wen-mei W. Hwu, 1991</a></dd>
 
 <dt><a name="8">[8]</a></dt>
 
 <dd><a href=
-"http://citeseer.ist.psu.edu/august96hyperblock.html">Hyperblock
+"http://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.39.1922">Hyperblock
 Performance Optimizations For ILP Processors; David Isaac August,
 1996</a></dd>