s390: Add support for the ecag insn. Patch from Divya Vyas
(divyvyas@linux.vnet.ibm.com) with mods to terminate the super block
with EmFail in case the insn is not available on the host.
Part of fixing bugzilla #275800.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2488 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/main_main.c b/priv/main_main.c
index 26f259e..58e166b 100644
--- a/priv/main_main.c
+++ b/priv/main_main.c
@@ -1030,6 +1030,8 @@
         return "Instruction stfle is not supported on this host";
    case EmFail_S390X_stckf:
         return "Instruction stckf is not supported on this host";
+   case EmFail_S390X_ecag:
+        return "Instruction ecag is not supported on this host";
      default: 
         vpanic("LibVEX_EmNote_string: unknown warning");
    }