RFR(XS): 8191787 - move private inline functions from thread.inline.hpp -> thread.cpp

[Daniel D. Daugherty]

Greetings,

Coleen, this is one of your Thread-SMR follow-up suggestions so I need
to hear from you on this thread. Thanks!

I have a simple cleanup fix for Thread-SMR. The bug is:

     JDK-8191787 move private inline functions from thread.inline.hpp -> 
thread.cpp
     https://bugs.openjdk.java.net/browse/JDK-8191787

This fix is pure code motion:

- moving inline functions from thread.inline.hpp -> thread.cpp
- making a few functions in thread.hpp private instead of public

Here is the webrev URL:

http://cr.openjdk.java.net/~dcubed/8191787-webrev/jdk10-0

This fix was (over) tested with a Mach5 tier[1-5] run. There were no
unexpected test failures.

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

Dan