Yikun Jiang f064d74e45 Cleanup the Arm64 CRC32 unused warning (#5565)
Summary:
When 'HAVE_ARM64_CRC' is set, the blew methods:

- bool rocksdb::crc32c::isSSE42()
- bool rocksdb::crc32c::isPCLMULQDQ()

are defined but not used, the unused-function is raised
when do rocksdb build.

This patch try to cleanup these warnings by add ifndef,
if it build under the HAVE_ARM64_CRC, we will not define
`isSSE42` and `isPCLMULQDQ`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5565

Differential Revision: D16233654

fbshipit-source-id: c32a9dda7465dbf65f9ccafef159124db92cdffd
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