Remove some debugging code that was accidentally checked in 
in r3038


git-svn-id: svn://svn.valgrind.org/vex/trunk@3039 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/main_main.c b/priv/main_main.c
index 58748a7..0d77e17 100644
--- a/priv/main_main.c
+++ b/priv/main_main.c
@@ -1581,8 +1581,6 @@
       }
 
       case VexArchAMD64: {
-            invalid_hwcaps(arch, hwcaps,
-                           "Support for AVX2 requires AVX capabilities\n");
          /* SSE3 and CX16 are orthogonal and > baseline, although we really
             don't expect to come across anything which can do SSE3 but can't
             do CX16.  Still, we can handle that case.  LZCNT is similarly