[11u] RFR 8222412: AARCH64: multiple instructions encoding issues

[Dmitry Chuyko]

Hello,

Original bug: https://bugs.openjdk.java.net/browse/JDK-8222412

Original patch applies almost cleanly except 1 change in 
assembler_aarch64.hpp. In jdk/jdk the fix is based on JDK-8214961 [1]. 
In jdk11u first half of JDK-8214961 is already backported in JDK-8216350 
[2]. The second half of JDK-8214961 is overridden by that single line 
change which is manually recreated to change the current code. I.e.

-    rf(Rs, 16), f(op1, 15), f(op2, 14, 12), f(0, 11, 10), rf(Rn, 5), 
zrf(Rt, 0);
instead of
-    rf(Rs, 16), f(op1, 15), f(op2, 14, 12), f(0, 11, 10), srf(Rn, 5), 
zrf(Rt, 0);

No need to backport JDK-8214961 as it is completely overridden by 
JDK-8222412 + JDK-8216350 backports.

11u webrev: http://cr.openjdk.java.net/~dchuyko/8222412/webrev.11u.00/

Testing: aarch64 build, tier1, tier2; asm_check in fastdebug build.

[1] https://bugs.openjdk.java.net/browse/JDK-8214961
[2] https://bugs.openjdk.java.net/browse/JDK-8216350

--
Thanks,
-Dmitry