misc: Substitute pointer to Request with aliased RequestPtr

Every usage of Request* in the code has been replaced with the
RequestPtr alias.  This is a preparing patch for when RequestPtr will be
the typdefed to a smart pointer to Request rather then a raw pointer to
Request.

Change-Id: I73cbaf2d96ea9313a590cdc731a25662950cd51a
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/10995
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>

src/mem/cache/base.cc

@@ -1278,7 +1278,7 @@ BaseCache::writebackBlk(CacheBlk *blk)
 
     writebacks[Request::wbMasterId]++;
 
-    Request *req = new Request(regenerateBlkAddr(blk), blkSize, 0,
+    RequestPtr req = new Request(regenerateBlkAddr(blk), blkSize, 0,
                                Request::wbMasterId);
     if (blk->isSecure())
         req->setFlags(Request::SECURE);
@@ -1313,7 +1313,7 @@ BaseCache::writebackBlk(CacheBlk *blk)
 PacketPtr
 BaseCache::writecleanBlk(CacheBlk *blk, Request::Flags dest, PacketId id)
 {
-    Request *req = new Request(regenerateBlkAddr(blk), blkSize, 0,
+    RequestPtr req = new Request(regenerateBlkAddr(blk), blkSize, 0,
                                Request::wbMasterId);
     if (blk->isSecure()) {
         req->setFlags(Request::SECURE);

src/mem/cache/cache.cc

@@ -872,7 +872,8 @@ Cache::cleanEvictBlk(CacheBlk *blk)
     assert(!writebackClean);
     assert(blk && blk->isValid() && !blk->isDirty());
     // Creating a zero sized write, a message to the snoop filter
-    Request *req =
+
+    RequestPtr req =
         new Request(regenerateBlkAddr(blk), blkSize, 0,
                     Request::wbMasterId);
     if (blk->isSecure())

src/mem/cache/prefetch/queued.cc

@@ -223,7 +223,7 @@ QueuedPrefetcher::insert(AddrPriority &pf_info, bool is_secure)
     }
 
     /* Create a prefetch memory request */
-    Request *pf_req =
+    RequestPtr pf_req =
         new Request(pf_info.first, blkSize, 0, masterId);
 
     if (is_secure) {