JDK-8180068: Access of mark word should use oopDesc::mark_offset_in_bytes() instead of '0' for sparc & arm

[Tatton, Jason]

Hi Everyone,

I'm Jason. I recently joined Amazon on the team supporting OpenJDK. I am new to the OpenJDK project and would like to contribute some starter bug fixes/enhancements/cleanups. I am working with my sponsor, Paul Hohensee.

I have a cleanup to submit. Please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8180068
http://cr.openjdk.java.net/~phh/8180068/webrev.00/

The code change is very straightforward, simply a substitution of '0' with 'oopDesc::mark_offset_in_bytes()' in the relevant 6 locations.

For testing I have run; 'run-test-tier1' and 'run-test-tier2' for: x86_64 and aarch64.

Regards,
--
Jason Taton