arm, mem: Remove unused CLEAR_LL request flag

Cleaning up dead code. The CLREX stores zero directly to
MISCREG_LOCKFLAG and so the request flag is no longer needed. The
corresponding functionality in the cache tags is also removed.

src/mem/cache/cache.cc

@@ -288,9 +288,6 @@ Cache::access(PacketPtr pkt, CacheBlk *&blk, Cycles &lat,
                 pkt->req->isInstFetch() ? " (ifetch)" : "",
                 pkt->getAddr());
 
-        if (pkt->req->isClearLL())
-            tags->clearLocks();
-
         // flush and invalidate any existing block
         CacheBlk *old_blk(tags->findBlock(pkt->getAddr(), pkt->isSecure()));
         if (old_blk && old_blk->isValid()) {

src/mem/cache/tags/base.hh

@@ -170,12 +170,6 @@ class BaseTags : public ClockedObject
      */
     virtual void computeStats() {}
 
-    /**
-     *iterated through all blocks and clear all locks
-     *Needed to clear all lock tracking at once
-     */
-    virtual void clearLocks() {}
-
     /**
      * Print all tags used
      */

src/mem/cache/tags/base_set_assoc.cc

@@ -135,14 +135,6 @@ BaseSetAssoc::findBlockBySetAndWay(int set, int way) const
     return sets[set].blks[way];
 }
 
-void
-BaseSetAssoc::clearLocks()
-{
-    for (int i = 0; i < numBlocks; i++){
-        blks[i].clearLoadLocks();
-    }
-}
-
 std::string
 BaseSetAssoc::print() const {
     std::string cache_state;

src/mem/cache/tags/base_set_assoc.hh

@@ -380,12 +380,6 @@ public:
         return ((tag << tagShift) | ((Addr)set << setShift));
     }
 
-    /**
-     *iterated through all blocks and clear all locks
-     *Needed to clear all lock tracking at once
-     */
-    virtual void clearLocks();
-
     /**
      * Called at end of simulation to complete average block reference stats.
      */

src/mem/cache/tags/fa_lru.cc

@@ -317,14 +317,6 @@ FALRU::check()
     return true;
 }
 
-void
-FALRU::clearLocks()
-{
-    for (int i = 0; i < numBlocks; i++){
-        blks[i].clearLoadLocks();
-    }
-}
-
 FALRU *
 FALRUParams::create()
 {

src/mem/cache/tags/fa_lru.hh

@@ -305,12 +305,6 @@ public:
         return (tag);
     }
 
-    /**
-     *iterated through all blocks and clear all locks
-     *Needed to clear all lock tracking at once
-     */
-    virtual void clearLocks();
-
     /**
      * @todo Implement as in lru. Currently not used
      */