Abhishek Madan c86a22ac43 Restrict RangeDelAggregator's tombstone end-key truncation (#4356)
Summary:
`RangeDelAggregator::AddTombstones` contained an assertion which stated that, if a range tombstone extended past the largest key in the sstable, then `FileMetaData::largest` must have a sentinel sequence number of `kMaxSequenceNumber`, which implies that the tombstone's end key is safe to truncate. However, `largest` will not be a sentinel key when the next sstable in the level's smallest key is equal to the current sstable's largest key, which caused the assertion to fail.

The assertion must hold for the truncation to be safe, so it has been moved to an additional check on end-key truncation.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4356

Differential Revision: D9760891

Pulled By: abhimadan

fbshipit-source-id: 7c20c3885cd919dcd14f291f88fd27aa33defebc
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