Add a tester for V-bit propagation through IROps. 
The tester is located in memcheck/tests/vbit-test.
It needs the following support on the valgrind / VEX side:
(1) a new client request VG_USERREQ__VEX_INIT_FOR_IRI
(2) a new "special instruction" on all architectures inserted via
    VALGRIND_VEX_INJECT_IR
(3) VEX changes to detect the special insn and insert IR (ir_inject.c)

The README file in vbit-test has some more information.
See also VEX r2490.  Fixes bugzilla #300102.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12906 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/Makefile.am b/Makefile.am
index 4dfb806..48ea4fc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -28,6 +28,7 @@
 	tests \
 	perf \
 	gdbserver_tests \
+	memcheck/tests/vbit-test \
 	auxprogs \
 	mpi \
 	docs