RFR: 8318015: Lock inflation not needed for OSR or Deopt for new locking modes [v2]

[Martin Doerr]

> Only LockingMode "LM_LEGACY" requires inflation before lock transfers because it is the only one which uses stack addresses in the mark word. I think we should treat the displaced header as stale data because it may be uninitialized.

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Skip copying displaced header.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16165/files
  - new: https://git.openjdk.org/jdk/pull/16165/files/089a0820..fb112413

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16165&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16165&range=00-01

  Stats: 31 lines in 2 files changed: 8 ins; 3 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/16165.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16165/head:pull/16165

PR: https://git.openjdk.org/jdk/pull/16165