RFR: 8366456: Allow AllocFailStrategy for RBTree

Mon Sep 1 08:16:24 UTC 2025

Right now the RBTree forces you to use the intrusive tree if you want fine-grained control of the out-of-memory strategy of the node allocations. We can change this to be a bit more flexible.

One of the tests were incorrectly indented, so I fixed that. I also changed from `typedef` to `using`, turns out that `typedef` can give strange errors when the template instantiation is incorrect[0].

[0] For my particular gcc

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Commit messages:
 - Fix
 - ?
 - Allow OOM strategy for RBTree

Changes: https://git.openjdk.org/jdk/pull/27011/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27011&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366456
  Stats: 46 lines in 2 files changed: 21 ins; 0 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/27011.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27011/head:pull/27011

PR: https://git.openjdk.org/jdk/pull/27011