Change DCHECK to assert to remove glog dep from Range

Summary:
This one DCHECK is the only thing keeping Range from
being free of external deps. Lets make it not be a thing, so
people are more inclined to pull in folly because Range is an
easy gateway class to the rest of folly.

Reviewed By: yfeldblum

Differential Revision: D21121743

fbshipit-source-id: 2a54e94074135c951526c50d4bb63ebf2076a72f

folly/container/SparseByteSet.h

@@ -16,10 +16,9 @@
 
 #pragma once
 
+#include <cassert>
 #include <cstdint>
 
-#include <glog/logging.h>
-
 namespace folly {
 
 /***
@@ -61,7 +60,7 @@ class SparseByteSet {
   inline bool add(uint8_t i) {
     bool r = !contains(i);
     if (r) {
-      DCHECK_LT(size_, kCapacity);
+      assert(size_ < kCapacity);
       dense_[size_] = i;
       sparse_[i] = uint8_t(size_);
       size_++;