Run benchmark with no debug

Summary: assert(Overlap) significantly slows down the benchmark. Ignore assertions when executing blob_store_bench.

Test Plan: Ran the benchmark

Reviewers: dhruba, haobo, kailiu

Reviewed By: kailiu

CC: leveldb

Differential Revision: https://reviews.facebook.net/D13737

tools/blob_store_bench.cc

@@ -8,6 +8,10 @@
 
 #define KB 1024LL
 #define MB 1024*1024LL
+// BlobStore does costly asserts to make sure it's running correctly, which
+// significantly impacts benchmark runtime.
+// NDEBUG will compile out those asserts.
+#define NDEBUG
 
 using namespace rocksdb;
 using namespace std;