RFR: 8338007: [JVMCI] ResolvedJavaMethod.reprofile can crash ciMethodData [v2]

[Tom Rodriguez]

> Graal unit testing uses ResolvedJavaMethod.reprofile to reset profiles between test but the current code rewrites the layout in a non-atomic way which can break other readers.  Instead perform the reinitialization at a safepoint which should protect all readers from seeing any transient initialization states.

Tom Rodriguez has updated the pull request incrementally with one additional commit since the last revision:

  Review comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21746/files
  - new: https://git.openjdk.org/jdk/pull/21746/files/94915e57..86c1625c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21746&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21746&range=00-01

  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21746.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21746/head:pull/21746

PR: https://git.openjdk.org/jdk/pull/21746