Optimize Arm64 crc32 implementation in PostgreSQL

Hi all,

Currently PostgreSQL has three different variants of a 32-bit CRC calculation: CRC-32C, CRC-32(Ethernet polynomial),
and a legacy CRC-32 version that uses the lookup table. Some ARMv8 (AArch64) CPUs implement the CRC32 extension which
is equivalent with CRC-32(Ethernet polynomial), so they can also benefit from hardware acceleration.

Can I propose a patch to optimize crc32 calculation with Arm64 specific instructions?

Any comments or feedback are welcome.
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