Fix enough stuff so it will start up and run for a few bbs on amd64,
before dying.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3230 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/vg_main.c b/coregrind/vg_main.c
index 2cc0231..1c9ad5a 100644
--- a/coregrind/vg_main.c
+++ b/coregrind/vg_main.c
@@ -1129,7 +1129,7 @@
 
    /* We know the initial ESP is pointing at argc/argv */
    VG_(client_argc) = *(Int*)cl_esp;
-   VG_(client_argv) = (Char**)(cl_esp + sizeof(Int));
+   VG_(client_argv) = (Char**)(cl_esp + sizeof(HWord));
 
    return cl_esp;
 }