fix compile warning
Merge pull request #61 from Yancey1989/master

fix compile warning
Fix share_table_files condition in BackupEngine constructor.

That makes BackupableDBTest.NoDoubleCopy test error.
Merge pull request #62 from matope/fix-BackupableDBTest-NoDoubleCopy-test-fail

Fix share_table_files condition in BackupEngine constructor.
Improve RocksDB "get" performance by computing merge result in memtable

Summary:
Added an option (max_successive_merges) that can be used to specify the
maximum number of successive merge operations on a key in the memtable.
This can be used to improve performance of the "get" operation. If many
successive merge operations are performed on a key, the performance of "get"
operations on the key deteriorates, as the value has to be computed for each
"get" operation by applying all the successive merge operations.

FB Task ID: #3428853

Test Plan:
make all check
db_bench --benchmarks=readrandommergerandom
counter_stress_test

Reviewers: haobo, vamsi, dhruba, sdong

Reviewed By: haobo

CC: zshao

Differential Revision: https://reviews.facebook.net/D14991