[wwwdocs] Document new pth-icm branch

[wwwdocs] Document new pth-icm branch

[Diego Novillo]

Since we are not sure whether pre-tokenized headers are worth
adding at all (the performance gains are minimal), Gabriel has
started removing that code and the parser instrumentation code we
had in the pph branch.

This will simplify branch maintenance wrt merges, but we are
still not sure whether we will do anything with PTH.  So, I have
created a sub-branch (pth-icm) to hold that code for now.

This patch adds documentation for it.

Committed to wwwdocs.


Diego.

Index: svn.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/svn.html,v
retrieving revision 1.161
diff -u -d -u -p -r1.161 svn.html
--- svn.html	27 Apr 2011 14:51:51 -0000	1.161
+++ svn.html	3 Jun 2011 13:58:10 -0000
@@ -495,6 +495,18 @@ the command <code>svn log --stop-on-copy
   href="mailto:crowl@google.com">Lawrence Crowl</a>.  Patches should be
   prefixed with <code>[pph]</code> in the subject line.</dd>
 
+  <dt>pth-icm</dt>
+  <dd>This is a sub-branch of the <code>pph</code> branch.  It
+  implements
+  <a href="http://gcc.gnu.org/wiki/pph#Pre-Tokenized_Headers_.28PTH.29">
+  Pre-Tokenized Headers for C++</a>.  Additionally, it contains
+  instrumentation code in the C++ parser that was used in an
+  incremental compiler model (icm) to study the effects of an
+  incremental compiler cache for a compiler server. The branch is
+  maintained by <a href="mailto:dnovillo@google.com">Diego Novillo</a>
+  and <a href="mailto:crowl@google.com">Lawrence Crowl</a>.  Patches
+  should be prefixed with <code>[pph]</code> in the subject line.</dd>
+
 </dl>
 
 <h3 id="distrobranches">Distribution Branches</h3>