[aarch64-port-dev ] Built-in simulator

[Aleksey Shipilev]

Hi,

I am looking through differences between AArch64 and upstream. One thing that sticks out in the
existence of built-in simulator: BUILTIN_SIM macro and friends protect lots of code. I wonder if
this is the leftover of the era when AArch64 was not available in silica?

Is built-in simulator still useful? If not, should we remove it to reduce the codebase? It is
present in all JDK releases, including 11 and 13. We could start there, and backport all the way
down to 8u.

-- 
Thanks,
-Aleksey