RFR(XS): 8012292: optimized build with GCC broken

[Roland Westrelin]

>>> Looks good. May be it is time to add optimized build (only build and no testing) as JPRT build targets on systems which are not bottlenecks.
>> 
>> Thanks for the review.
>> Are you suggesting I do anything else as part of this change?
> 
> Yes, please. At least on some platforms (Linux 64 ? and Win 64?). Look on east and hotspotwest queues result and see which finished build and testing first. And we just removed debug build - so it should not affect much JPRT job time.

I'm pushing this change as is and I've filed 8013869 to enable jprt optimized builds.

Roland.