[jdk21u-dev] RFR: 8324121: SIGFPE in PhaseIdealLoop::extract_long_range_checks

[Aleksey Shipilev]

Clean backport to improve C2 reliability. 

Additional testing:
 - [x] New test DOES NOT fail without the patch, passes with it
 - [ ] Linux x86_64 server fastdebug, `all` tests

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Commit messages:
 - Backport cb2a6713596548d76c03912709656172b0bbcc76

Changes: https://git.openjdk.org/jdk21u-dev/pull/488/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=488&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324121
  Stats: 70 lines in 3 files changed: 61 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/488.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/488/head:pull/488

PR: https://git.openjdk.org/jdk21u-dev/pull/488