RFR(XXS) 8068592 Remove unused code in objectMonitor.hpp

[Daniel D. Daugherty]

Greetings,

I have a fix ready for the following RFE:

     JDK-8068592 Remove unused code in objectMonitor.hpp
     https://bugs.openjdk.java.net/browse/JDK-8068592

Yes, this an RFE and I'm fixing it now for a few reasons:

1) I promised Claes Redestad back on 04.25 that this would be the first
    issue I worked on when I got my Solaris-X64 environment back. mt-haku
    is now running Solaris 11.2 SRU5.5 so it is back!

2) This is the simplest change in my queue with little to no risk so it
    makes the perfect test case for my upgrade of mt-haku from Solaris
    10u11 -> Solaris 11.2 SRU5.5.

3) This change gets rid of unused fields, unused macro assembler functions
    and a couple of declared but not defined functions from ObjectMonitor.
    Slimming down ObjectMonitor is never a bad thing!

Yes, I know that the process for getting approval for RFEs is not yet
defined. However, I want to get the code review out of the way so that
this changeset can go in if it is approved.

Sanity check: I searched a JDK9-hs clone for the following patterns:

     FreeNext_offset_in_bytes
     Responsible_offset_in_bytes
     Spinner_offset_in_bytes
     TrySpin_Fixed
     TrySpin_VaryFrequency
     WaitSet_offset_in_bytes
     _SpinClock
     _SpinFreq
     _SpinState

and found no mentions outside of the ones that I'm deleting from
src/share/vm/runtime/objectMonitor.hpp.

Webrev URL: 
http://cr.openjdk.java.net/~dcubed/8068592-webrev/0-jdk9-hs-hotspot/

Testing: JPRT test builds are in process.

Thanks, in advance, for any comments, suggestions or feedback.

Dan