s390: Update IR generation for the SRNM insn. 
Add support for the SRNMB insn.
New emulation warning EmWarn_S390X_invalid_rounding.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2538 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/main_main.c b/priv/main_main.c
index bbfc7ec..a04a10f 100644
--- a/priv/main_main.c
+++ b/priv/main_main.c
@@ -1031,6 +1031,9 @@
                "  feature requires the floating point extension facility.\n"
                "  which is not available on this host. Continuing using\n"
                "  the rounding mode from FPC. Results may differ!";
+     case EmWarn_S390X_invalid_rounding:
+        return "The specified rounding mode is invalid.\n"
+               "  Continuing using 'round to nearest'. Results may differ!";
      case EmFail_S390X_stfle:
         return "Instruction stfle is not supported on this host";
      case EmFail_S390X_stckf: