Build break fix

Summary:
(1) Integer size correction (mac build break)
(2) snprint usage in Windows (windows build break)

Test Plan: Build in windows and mac

Reviewers: sdong

Subscribers: andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D60927

utilities/persistent_cache/block_cache_tier_file.cc

@@ -38,7 +38,7 @@ Status NewRandomAccessCacheFile(Env* const env, const std::string& filepath,
 //
 // BlockCacheFile
 //
-Status BlockCacheFile::Delete(size_t* size) {
+Status BlockCacheFile::Delete(uint64_t* size) {
   Status status = env_->GetFileSize(Path(), size);
   if (!status.ok()) {
     return status;

utilities/persistent_cache/block_cache_tier_file.h

@@ -126,7 +126,7 @@ class BlockCacheFile : public LRUElement<BlockCacheFile> {
   // get block information
   std::list<BlockInfo*>& block_infos() { return block_infos_; }
   // delete file and return the size of the file
-  virtual Status Delete(size_t* size);
+  virtual Status Delete(uint64_t* size);
 
  protected:
   port::RWMutex rwlock_;               // synchronization mutex

utilities/simulator_cache/sim_cache.cc

@@ -133,8 +133,13 @@ class SimCacheImpl : public SimCache {
                "\n");
     res.append("SimCache HITs:    " + std::to_string(get_hit_counter()) + "\n");
     char buff[100];
+#ifdef OS_WIN
+    _snprintf(buff, sizeof(buff), "SimCache HITRATE: %.2f%%\n",
+              get_hit_rate() * 100);
+#else
     snprintf(buff, sizeof(buff), "SimCache HITRATE: %.2f%%\n",
              get_hit_rate() * 100);
+#endif
     res.append(buff);
     return res;
   }