mem-cache: Remove unnecessary block initialization on writeback

Change-Id: Ia9b825bcbb8d326705f74c15a93a88703153ba5a
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/8283
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>

src/mem/cache/cache.cc

diff --git a/src/mem/cache/cache.cc b/src/mem/cache/cache.cc
index 1821f18..622f0f7 100644
--- a/src/mem/cache/cache.cc
+++ b/src/mem/cache/cache.cc
@@ -1662,8 +1662,6 @@
         req->setFlags(Request::SECURE);
 
     req->taskId(blk->task_id);
-    blk->task_id= ContextSwitchTaskId::Unknown;
-    blk->tickInserted = curTick();
 
     PacketPtr pkt =
         new Packet(req, blk->isDirty() ?
@@ -1742,8 +1740,6 @@
         req->setFlags(Request::SECURE);
 
     req->taskId(blk->task_id);
-    blk->task_id = ContextSwitchTaskId::Unknown;
-    blk->tickInserted = curTick();
 
     PacketPtr pkt = new Packet(req, MemCmd::CleanEvict);
     pkt->allocate();