[11u] RFR 8266642: Improve ResolvedMethodTable hash function

[Denghui Dong]

Hi,

May I have a review of this small backport to 11u:

JBS: https://bugs.openjdk.java.net/browse/JDK-8266642
Original patch: https://git.openjdk.java.net/jdk/pull/3901.diff

webrev: http://cr.openjdk.java.net/~ddong/8266642/webrev.00/

This patch is almost a clean backport except there needs a manual adjustment at 'method_hash' since the context is different.

For the problem that the patch wants to solve, please refer to: https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2021-May/048014.html

testing: hotspot_tier1 jdk_tier1

Thanks,
Denghui Dong