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/include/pub_tool_signals.h b/include/pub_tool_signals.h
index 32deda3..9393237 100644
--- a/include/pub_tool_signals.h
+++ b/include/pub_tool_signals.h
@@ -36,8 +36,8 @@
 // not expected to return.
 //
 // It's frustrating that we need this header for a single function used
-// only by Memcheck and Addrcheck during leak checking.  We should find
-// a way to remove the need for this file.
+// only by Memcheck during leak checking.  We should find a way to remove
+// the need for this file.
 extern void VG_(set_fault_catcher)(void (*catcher)(Int sig, Addr addr));
 
 #endif   // __PUB_TOOL_SIGNALS_H