Get rid of baseBlock.  Now, when generated code is running, the guest
state pointer points directly at the ThreadState.arch.vex field, thus
updating it in place and avoiding a lot of code (and time-wasting)
which copies stuff back and forth to baseBlock.

Fix zillions of other places in the system where the current thread id
is needed.  It is now passed to all needed places.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3090 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index 222e03f..f79868f 100644
--- a/configure.in
+++ b/configure.in
@@ -13,14 +13,14 @@
 #    AS_HELP_STRING([--with-vex], [Vex directory (must be specified!)]),
 #
 AC_ARG_WITH(vex, 
-    [  --with-vex=<DIR>        Vex directory (must be specified!)],
+    [  --with-vex=/path/to/vex/dir    Vex directory (must be specified!)],
 [
     AC_CHECK_FILE($withval/pub/libvex.h,
         [VEX_DIR=$withval],
         [AC_MSG_ERROR([Directory '$withval' does not exist, or does not contain Vex])])
 ],
 [
-    AC_MSG_ERROR([You must specify --with-vex=<DIR>])
+    AC_MSG_ERROR([You must specify --with-vex=/path/to/vex/dir])
 ])
 AC_SUBST(VEX_DIR)