RFR (jdk11): Backport JDK-8217016 and JDK-8217874

[Roman Kennke]

>> Webrev:
>> http://cr.openjdk.java.net/~rkennke/backport-jdk11-2019-05-06/webrev.00/
> 
> *) c1_LIRAssembler_aarch64.cpp: stray assert
> 
> 1585     }    assert(op->tmp1()->is_valid(), "must be");
> 
> Otherwise looks fine.
> 

Oops. Updated webrev:
http://cr.openjdk.java.net/~rkennke/backport-jdk11-2019-05-06/webrev.01/

Roland, can you eyeball the changes?

Thanks,
Roman