RFR(L) Valhalla support for AArch64

[Tobias Hartmann]

Hi Dmitry,

Great progress!

On 26.01.19 15:30, Dmitry Samersoff wrote:
> 1. Support for ValueTypePassFieldsAsArgs=true, which is false by
>    default, is not implemented.
> 
>       I did required changes but realized that I have no specific
>       tests and I don't like resulting code in general.

All the compiler valhalla tests are executed with different flag combinations of
ValueTypePassFieldsAsArgs and ValueTypeReturnedAsFields. If they pass, you should have some
reasonable coverage.

> 2. Support for MatchVVEPNode is not implemented.

FYI, I'm working on JDK-8215559 which will introduce new entry points and change all the related
code code a lot (refactoring/cleanups/bug fixes). My patch is not yet stable but I expect it to be
ready by the end of this week. It might be worth holding off on your side until this is in.

Best regards,
Tobias