[jdk18u] RFR: 8281168: Micro-optimize VarForm.getMemberName for interpreter [v2]

[Aleksey Shipilev]

> Clean backport to improve interpreter performance.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1`

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into JDK-8281168-varform-interp
 - Backport fc77217814eb1a346d7380299abdc2b01a69b4de

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk18u/pull/40/files
  - new: https://git.openjdk.java.net/jdk18u/pull/40/files/73075ca8..f999c07d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=40&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=40&range=00-01

  Stats: 242 lines in 7 files changed: 215 ins; 5 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/40.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/40/head:pull/40

PR: https://git.openjdk.java.net/jdk18u/pull/40