Propose to use clang-format to enforce hotspot codestyle

[Florian Weimer]

* Nick Gasson:

> On 03/13/20 17:42 pm, Andrew Dinn wrote:
>> On 13/03/2020 09:08, Andrew Haley wrote:
>>> I could submit a patch to the offending files so that everyone editing
>>> them with emacs will benefit. I'm not sure if that'll offend anyone's
>>> sense of purity, though. It only needs this at the end of the files:
>>>
>>> // Local Variables:
>>> // mode: fundamental
>>> // End:
>>>
>>> WDYT?
>> All doubt re that question can be readily resolved by my handy,
>> /prescriptive/ emacs-as-one-true-OpenJDK-IDE-of-choice guide. Any takers?
>>
>
> Seems like many of us were suffering in silence. I reported this to the
> cc-mode author: the patch here is a huge improvement, although it's
> still a bit slow.
>
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=40052#8

Nice.  Will the globals.hpp situation improve further as the result of
the flags modularization work?

<https://wiki.openjdk.java.net/display/HotSpot/HotSpot+Command-Line+Flags+Overhaul+-+Design+Doc>

It looks to me the large macro is removed.