[8u] RFR for backport of 8216376 (CRC32 2/4): [PPC64] Possibly unreliable stack frame resizing in template interpreter

[Gustavo Romero]

Hi,

Could the following backport for jdk8u be reviewed please?

Bug	: https://bugs.openjdk.java.net/browse/JDK-8216376
Original: http://hg.openjdk.java.net/jdk/jdk12/rev/672b629e1f72
Backport: http://cr.openjdk.java.net/~gromero/crc32_jdk8u/for-review/8216376/

It improves stack frame resizing in the interpreter and is also a preparation to
subsequent changes in the CRC32 backport patchset. It's a PPC64-only change.

It was necessary to backport it to:

- Adapt file names to OpenJDK 8u
- Remove code related to crc32c part

Thank you.

Best regards,
Gustavo