[jdk17u-dev] RFR: 8314024: SIGSEGV in PhaseIdealLoop::build_loop_late_post_work due to bad immediate dominator info [v2]

[Roman Marchenko]

> Clean backport.
> Tests in compiler/loopopts are passed.

Roman Marchenko has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport ed1ea5fe7c6fad03ca96e7dece2127eab21a608a

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Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1714/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1714/files/6ee0aee9..96bf2f42

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1714&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1714&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1714.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1714/head:pull/1714

PR: https://git.openjdk.org/jdk17u-dev/pull/1714