Update pprof (from gperftools 2.0).

ChangeLog

@@ -34,6 +34,7 @@ found in the git revision history:
   - Add the --with-mangling option.
   - Add the --disable-experimental option.
   - Add the "thread.tcache.enabled" mallctl.
+  - Update pprof (from gperftools 2.0).
 
   Incompatible changes:
   - Enable stats by default.

doc/jemalloc.xml.in

@@ -1006,7 +1006,7 @@ malloc_conf = "xmalloc:true";]]></programlisting>
         option for information on high-water-triggered profile dumping.
         Profile output is compatible with the included <command>pprof</command>
         Perl script, which originates from the <ulink
-        url="http://code.google.com/p/google-perftools/">google-perftools
+        url="http://code.google.com/p/gperftools/">gperftools
         package</ulink>.</para></listitem>
       </varlistentry>