Modularised assertions and panics in m_libcassert.

As part of this, killed the VG_STRINGIFY macro, which was used to expand
out names like "VG_(foo)" and "vgPlain_foo" in assertion failure
messages.  This is good since we actually want the "VG_(foo)" form used
in these messages.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3842 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_errormgr.c b/coregrind/m_errormgr.c
index fe36d22..71ae7ce 100644
--- a/coregrind/m_errormgr.c
+++ b/coregrind/m_errormgr.c
@@ -33,6 +33,7 @@
 #include "pub_core_errormgr.h"
 #include "pub_core_execontext.h"
 #include "pub_core_libcbase.h"
+#include "pub_core_libcassert.h"
 #include "pub_core_libcprint.h"
 #include "pub_core_main.h"          // for VG_(start_debugger)()
 #include "pub_core_options.h"