Fix Forward Iterator Seek()/SeekToFirst()
Summary: In ForwardIterator::SeekInternal(), we may end up passing empty Slice representing an internal key to InternalKeyComparator::Compare. and when we try to extract the user key from this empty Slice, we will create a slice with size = 0 - 8 ( which will overflow and cause us to read invalid memory as well ) Scenarios to reproduce these issues are in the unit tests Closes https://github.com/facebook/rocksdb/pull/1467 Differential Revision: D4136660 Pulled By: lightmark fbshipit-source-id: 151e128
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