RFR: 8076177: Remove usage of stack.inline.hpp functions from taskqueue.hpp

[Stefan Karlsson]

Hi,

Please review this patch to move the implementation of the push, pop, 
and steal functions out of taskqueue.hpp into a new taskqueue.inline.hpp 
file.

I've split the patch into three part, but intend to push them as one 
change, unless someone wants this to be pushed as three separate changes.

http://cr.openjdk.java.net/~stefank/8076177/webrev.01/00.movePush/
http://cr.openjdk.java.net/~stefank/8076177/webrev.01/01.movePop/
http://cr.openjdk.java.net/~stefank/8076177/webrev.01/02.moveSteal/
http://cr.openjdk.java.net/~stefank/8076177/webrev.01/all/

https://bugs.openjdk.java.net/browse/JDK-8076177

The patch builds upon this patch that hasn't been pushed yet:
http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-April/013039.html

Thanks,
StefanK