mem-ruby: fix CHI Evict race condition (#217)

When an Evict request is received from upstream for a shared line and
the line is no longer cached locally (or on any other upstream cache),
we need to also send an Evict downstream. In this case we need to wait
until our outgoing Evict completes before completing the Evict from
upstream in order be able to resolve race conditions with incoming
snoops. E.g.: while our outgoing Evict is pending we may receive a snoop
requesting data, but we won't be able to complete this snoop if we have
already completed all upstream Evicts and we no longer have the line.

src/mem/ruby/protocol/chi/CHI-cache-actions.sm

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022 ARM Limited
+ * Copyright (c) 2021-2023 ARM Limited
  * All rights reserved
  *
  * The license below extends only to copyright in the software and shall
@@ -923,8 +923,8 @@ action(Initiate_Evict, desc="") {
       tbe.actions.push(Event:WriteBEPipe);
       tbe.actions.push(Event:SendWBData);
     } else {
-      tbe.actions.push(Event:SendCompIResp);
       tbe.actions.push(Event:SendEvict);
+      tbe.actions.push(Event:SendCompIResp);
     }
   } else {
     tbe.actions.push(Event:SendCompIResp);