[aarch64-port-dev ] RFR: 8195588: AArch64: Codegen fix after JDK-8194256

[Ningsheng Jian]

Hi,

JDK-8194256 updated some shift constant encoding logic in assembler,
which caused some new hotspot Vect jtreg test failures under
compiler/c2/cr6340864/. Since these instructions are being used in
compiler, we should also update their usages.

Bug: https://bugs.openjdk.java.net/browse/JDK-8195588
Webrev: http://cr.openjdk.java.net/~njian/8195588/webrev.00/

With the new patch, those failed jtreg vect tests passed, and no other
new failure found.

Please help to review this fix.

Thanks,
Ningsheng