[11u] RFR: 8247766: [aarch64] guarantee(val < (1U << nbits)) failed: Field too big for insn

[Doerr, Martin]

Hi,

JDK-8247766 is backported to 11.0.11-oracle. I'd like to backport it for parity.
Change doesn't apply cleanly.
I had to apply failing hunks manually which are listed here: http://cr.openjdk.java.net/~mdoerr/8247766_aarch64_11u/8247766_aarch64_failed_hunks.txt
Note that there are minor differences regarding integer types. I've taken the new implementation.
In addition, I have taken "legitimize_address" from upstream. It was missing in 11u.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8247766

Original change:
https://hg.openjdk.java.net/jdk/jdk/rev/40c07de877ab

11u backport:
http://cr.openjdk.java.net/~mdoerr/8247766_aarch64_11u/webrev.00/

Please review.

Best regards,
Martin