table/bloom_block.*: pass func parameter by reference

[table/bloom_block.h:29]: (performance) Function parameter
 'keys_hashes' should be passed by reference.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

table/bloom_block.cc

@@ -11,7 +11,7 @@
 
 namespace rocksdb {
 
-void BloomBlockBuilder::AddKeysHashes(const std::vector<uint32_t> keys_hashes) {
+void BloomBlockBuilder::AddKeysHashes(const std::vector<uint32_t>& keys_hashes) {
   for (auto hash : keys_hashes) {
     bloom_.AddHash(hash);
   }

table/bloom_block.h

@@ -26,7 +26,7 @@ class BloomBlockBuilder {
 
   uint32_t GetNumBlocks() const { return bloom_.GetNumBlocks(); }
 
-  void AddKeysHashes(const std::vector<uint32_t> keys_hashes);
+  void AddKeysHashes(const std::vector<uint32_t>& keys_hashes);
 
   Slice Finish();