target-alpha: fix emulation of ecb

As ECB is a hint, it can be safely emulated as a nop.

This change is necessary to boot Tru64.
Signed-off-by: NTristan Gingold <gingold@adacore.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7111 c046a42c-6fe2-441c-8c8c-71466251a162

target-alpha/translate.c

@@ -1732,12 +1732,6 @@ static always_inline int translate_one (DisasContext *ctx, uint32_t insn)
             break;
         case 0xE800:
             /* ECB */
-            /* XXX: TODO: evict tb cache at address rb */
-#if 0
-            ret = 2;
-#else
-            goto invalid_opc;
-#endif
             break;
         case 0xF000:
             /* RS */