@madler: It is possible to look and merge some PRs?

Thanks in advance.

PRs:

• Add optimized crc32 for Power 8+ processors #857 @mmatti-sw
• Add optimized crc32 for Power 8+ processors #750 @mmatti-sw @ljavorsk @nmoinvaz @iii-i @tuliom
• Add optimized crc32 for Power 8+ processors #478 @mscastanho @fweimer-rh @ljavorsk @tuliom @RajalakshmiSR @er-1
• Optimized CRC32 framework with Power crc32 c optimized function #335 @grooverdan @Adenilson @julian-klode

And:

• Add optimized longest_match for Power processors #459 @mscastanho
• Add optimization for Adler32 checksum for Power processors #458 @racardoso @mscastanho
• Add optimized slide_hash for Power processors #457 @mscastanho

cc: @antonblanchard.