Ayappan 1d068f6067 Fix CompactRange incorrect buffer release
Summary:
While running `make jtest` using IBM Java, it fails at compactRangeToLevel with the below error.

```
Run: org.rocksdb.RocksDBTest testing now -> compactRangeToLevel
JVMJNCK056E JNI error in ReleaseByteArrayElements: Got memory 0x00003FFF94AA8908 from object 0x00000000000C7F78, releasing from 0x00000000000C7F68
JVMJNCK077E Error detected in org/rocksdb/RocksDB.compactRange0(J[BI[BIZII)V

JVMJNCK024E JNI error detected. Aborting.
JVMJNCK025I Use -Xcheck:jni:nonfatal to continue running when errors are detected.

Fatal error: JNI error
Makefile:205: recipe for target 'run_test' failed
make[1]: *** [run_test] Error 87
make[1]: Leaving directory '/home/ubuntu/rocksdb/java'
Makefile:1542: recipe for target 'jtest' failed
make: *** [jtest] Error 2
```

After checking the code, it is vivid that we are messing up the `ReleaseByteArrayElements` args in `rocksdb_compactrange_helper`.

```
   .................
   1959     s = db->CompactRange(compact_options, &begin_slice, &end_slice);
   1960   }
Closes https://github.com/facebook/rocksdb/pull/2060

Differential Revision: D4831427

Pulled By: yiwu-arbug

fbshipit-source-id: dd02037
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RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

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RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

This code is a library that forms the core building block for a fast key value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it specially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/

Description
A library that provides an embeddable, persistent key-value store for fast storage.
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