RFR: 8224851: AArch64: fix warnings and errors with Clang and GCC 8.3

[Nick Gasson]

Hi Andrew,

On 03/06/2019 16:32, Andrew Haley wrote:
> 
> I don't think there's any need to boycott the whole compiler because
> of this bug. It would make more sense to try to get clang fixed.
> 
> Maybe for now put the cast in #ifdef CLANG ?
> 

I think I'd rather put the __atomic_fetch_add in an #ifdef CLANG? This 
seems a bit neater than casting the integer argument to a pointer.

Did you have any thoughts about os::current_stack_pointer() from my 
earlier email?


Thanks,
Nick