[jdk11u-dev] RFR: 8266642: improve ResolvedMethodTable hash function

[Denghui Dong]

Backport of 8266642.

This patch improves the performance of ResolvedMethodTable when there are many classes with the same name.

Reviewed and approved:  https://bugs.openjdk.java.net/browse/JDK-8266642

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Commit messages:
 - 8266642: improve ResolvedMethodTable hash function

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/12/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=12&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266642
  Stats: 21 lines in 3 files changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/12.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/12/head:pull/12

PR: https://git.openjdk.java.net/jdk11u-dev/pull/12