Squashed 'src/leveldb/' changes from 688561cba8..04b5790928

04b5790928 Merge bitcoin-core/leveldb-subtree#46: Fix invalid pointer arithmetic in Hash (#1222)
59669817c5 Merge bitcoin-core/leveldb-subtree#40: cherry-pick: Remove leveldb::port::kLittleEndian.
73013d1a37 Merge bitcoin-core/leveldb-subtree#45: [jumbo] Add begin()/end() to Slice.
a8844b23ab Fix invalid pointer arithmetic in Hash (#1222)
be4dfc94b3 [jumbo] Add begin()/end() to Slice.
2e3c0131d3 Remove leveldb::port::kLittleEndian.

git-subtree-dir: src/leveldb
git-subtree-split: 04b57909285c7335c1908d53bcde9b90fe0439be

include/leveldb/slice.h

@@ -52,6 +52,9 @@ class LEVELDB_EXPORT Slice {
   // Return true iff the length of the referenced data is zero
   bool empty() const { return size_ == 0; }
 
+  const char* begin() const { return data(); }
+  const char* end() const { return data() + size(); }
+
   // Return the ith byte in the referenced data.
   // REQUIRES: n < size()
   char operator[](size_t n) const {