[8u] RFR for backport of 8217459 (CRC32 4/4): [PPC64] Cleanup non-vector version of CRC32

[Gustavo Romero]

Hi Martin,

Change 8206173 is now backported to jdk8u-dev:

http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/9148fcba5de9

So could you please review v3 CRC32 4/4 accordingly to your last review? The
change now is PPC64-only since shared code part was pushed with 8206173.

Please find v3 in:

http://cr.openjdk.java.net/~gromero/crc32_jdk8u/for-review/v3_/8217459/

Thank you & best regards,
Gustavo