Propose to use clang-format to enforce hotspot codestyle

[Ioi Lam]

On 4/17/20 11:27 AM, Florian Weimer wrote:
> * Nick Gasson:
>
>> On 03/13/20 17:42 pm, Andrew Dinn wrote:
>> 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.
Actually, I am going with a different direction with the flags clean up. 
The big macro will stay (John Rose convinced me that I can do all the 
things I wanted while keeping the existing macros largely unchanged). I 
have created a new RFE (and sub-tasks)

https://bugs.openjdk.java.net/browse/JDK-8243208

I'll post a new design doc/prototype soon.

I'll leave the tackling of the big macro to braver souls.

- Ioi