RFR: Several aarch64-related C1 fixes

[Aleksey Shipilev]

On 07/10/2018 12:33 PM, Roman Kennke wrote:
> 1. The write-barrier stub must bind the entry and branch back to
> continuation
> 2. The mask in the WB LIR needs an extra register, otherwise it won't
> compile in aarch64
> 3. bonus: handle both 2- and 3-arg for of logical_and()
> 
> http://cr.openjdk.java.net/~rkennke/aarch64-c1fixes/webrev.01/

Looks good. It seems to pass x86_64 tier3_gc_shenandoah and ad-hoc tests on aarch64 for me.

Let's commit the fix in two changesets: C1 fix (which is in the shared code), and stub continuation
fix (which is aarch64-specific).

-Aleksey