[jdk11u-dev] RFR: 8326101: [PPC64] Need to bailout cleanly if creation of stubs fails when code cache is out of space

[Martin Doerr]

Backport of [JDK-8326101](https://bugs.openjdk.org/browse/JDK-8326101). Version from 22u applies cleanly, but 11u uses `NULL` instead of `nullptr` (replaced by 2nd commit).

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Commit messages:
 - 11u uses NULL instead of nullptr.
 - Backport e3ae81eeeee8e2b0063a576a90624dd927b512f0

Changes: https://git.openjdk.org/jdk11u-dev/pull/2604/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2604&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326101
  Stats: 11 lines in 2 files changed: 9 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2604.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2604/head:pull/2604

PR: https://git.openjdk.org/jdk11u-dev/pull/2604