sdong 6c50fe1ec9 Change HashMap::Insert()'s value to a const reference ()
Summary:
When building RocksDB on VS2015, an error shows up with

hash_map.h(39): error C2719: 'value': formal parameter with requested alignment of 8 won't be aligned

Making the reference a reference can solve the problem, and there isn't a reason we can't do that, at least for the current use of the hash map.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6567

Test Plan: See CI tests pass.

Reviewed By: pdillinger

Differential Revision: D20548543

fbshipit-source-id: 255b55d74cf68a0b324e6f504c56608a97ea6276
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