Fix JSErr_Limit, broken by rev 41df9affe00f. No bug, r=red.

--HG--
extra : rebase_source : 5e52c66efe5475479f10f8aded036de6850eb365

js/src/vm/Xdr.h

@@ -33,7 +33,7 @@ static const uint32_t XDR_BYTECODE_VERSION_SUBTRAHEND = 245;
 static const uint32_t XDR_BYTECODE_VERSION =
     uint32_t(0xb973c0de - XDR_BYTECODE_VERSION_SUBTRAHEND);
 
-static_assert(JSErr_Limit == 383,
+static_assert(JSErr_Limit == 384,
               "GREETINGS, POTENTIAL SUBTRAHEND INCREMENTER! If you added or "
               "removed MSG_DEFs from js.msg, you should increment "
               "XDR_BYTECODE_VERSION_SUBTRAHEND and update this assertion's "