Sync from jdk8/jdk8/hotspot to ppc-aix-port/stage/hotspot

[Vladimir Kozlov]

I am only syncing Hotspot this week because I am not sure how to merge 
generated-configure.sh in top ppc-aix-port/stage directory.

The hotspot merge has fix for "8017308: Remove unused breakpoint 
relocation type" so Goetz can push (Part 4)"add relocation for 
trampoline stubs".

Note, the fix for "8019382: PPC64: Fix bytecodeInterpreter to compile 
with '-Wunused-value'" will be merged next week.

thanks,
Vladimir