Merge in the COMPVBITS branch to the trunk.  This is a big change to
Memcheck, replacing the 9-bits-per-byte shadow memory representation to a
2-bits-per-byte representation (with possibly a little more on the side) by
taking advantage of the fact that extremely few memory bytes are partially
defined.

For the SPEC2k benchmarks with "test" inputs, this speeds up Memcheck by a
(geometric mean) factor of 1.20, and reduces the size of shadow memory by a
(geometric mean) factor of 4.26.

At the same time, Addrcheck is removed.  It hadn't worked for quite some
time, and with these improvements in Memcheck its raisons-d'etre have
shrivelled so much that it's not worth the effort to keep around.  Hooray!

Nb: this code hasn't been tested on PPC.  If things go wrong, look first in
the fast stack-handling functions (eg. mc_new_mem_stack_160,
MC_(helperc_MAKE_STACK_UNINIT)).


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5791 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/docs/internals/xml-output.txt b/docs/internals/xml-output.txt
index 631c0d2..eaf16dc 100644
--- a/docs/internals/xml-output.txt
+++ b/docs/internals/xml-output.txt
@@ -34,7 +34,7 @@
 caveats.
 
 * At the present time only Memcheck is supported.  The scheme extends
-  easily enough to cover Addrcheck and Helgrind if needed.
+  easily enough to cover Helgrind if needed.
 
 * When XML output is selected, various other settings are made.
   This is in order that the output format is more controlled.