RFR: 8340544: Optimize setLocalsFromArg [v2]

[Shaojin Wen]

> CheckLocal once, reduce redundant checkLocal, rewrite switch, reduce method size, codeSize is reduced from 367 to 263.

Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:

  more compact

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21106/files
  - new: https://git.openjdk.org/jdk/pull/21106/files/9d554f11..7d71290b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21106&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21106&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21106.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21106/head:pull/21106

PR: https://git.openjdk.org/jdk/pull/21106