RFR(T): 8233530: gcc 5.4 build warning -Wc++14-compat after JDK-8233359

[Kim Barrett]

> On Nov 6, 2019, at 9:46 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>> On Nov 6, 2019, at 8:21 AM, David Holmes <david.holmes at oracle.com> wrote:
>> 
>> On 6/11/2019 11:17 pm, Thomas Stüfe wrote:
>>> Hi David,
>>> sorry for that. I had marked this as trivial, understood your initial answer as valid Review and pushed this after getting a second review from Goetz.
>>> But no problem, I can do a follow up patch. What are the remaining criticisms? Removal of the _GNUG_ define?
>> 
>> I'll let Kim decide whether it is worth following up on this.
> 
> Those #ifdefs look really odd, and this file might not be touched again for a while.
> What’s one more time through the spin cycle? :)  Sigh.  I thought 8233359 was going to be easy.

Let’s leave it to post JEP 347 cleanup: https://bugs.openjdk.java.net/browse/JDK-8233724