Dmitry Fink e07aa8669d Allow full merge when root of history for a key is reached (#4909)
Summary:
Previously compaction was not collapsing operands for a first
key on a layer, even in cases when it was its root of history. Some
tests (CompactionJobTest.NonAssocMerge) was actually accounting
for that bug,
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4909

Differential Revision: D13781169

Pulled By: finik

fbshipit-source-id: d2de353ecf05bec39b942cd8d5b97a8dc445f336
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