rocksdb/build_tools
Andrew Kryczka 07c2738ffa prefer enabling cpu features via -march/-mcpu
Summary:
If possible, use -march or -mcpu to get enable all features available on the local CPU or architecture. Only if this is impossible, we will manually set -msse4.2. It should be safe as there'll be a warning printed if `USE_SSE` is set and the provided flags are insufficient to support SSE4.2.
Closes https://github.com/facebook/rocksdb/pull/3156

Differential Revision: D6304703

Pulled By: ajkr

fbshipit-source-id: 030a53491263300cae7fafb429114d87acc828ef
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