RFR: 8343158: [JVMCI] ZGC should deoptimize on old gen allocation [v2]

[Tom Rodriguez]

> JVMCI also needs the special handling that ZGC performs for C2 for slow path allocations that are performed in old gen.

Tom Rodriguez 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 tkr-zgc-deoptimize-allocation
 - 8343158: [JVMCI] ZGC should deoptimize on old gen allocation

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24957/files
  - new: https://git.openjdk.org/jdk/pull/24957/files/1cffe543..aba20dc8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24957&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24957&range=00-01

  Stats: 435 lines in 17 files changed: 268 ins; 42 del; 125 mod
  Patch: https://git.openjdk.org/jdk/pull/24957.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24957/head:pull/24957

PR: https://git.openjdk.org/jdk/pull/24957