[jdk17u-dev] RFR: 8282045: When loop strip mining fails, safepoints are removed from loop anyway

[Martin Doerr]

Backport of [JDK-8282045](https://bugs.openjdk.java.net/browse/JDK-8282045)

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Commit messages:
 - Backport 2c5d266f9f20005bc2a6c30dcaa95b059ea59d74

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/312/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=312&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282045
  Stats: 203 lines in 3 files changed: 165 ins; 25 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/312.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/312/head:pull/312

PR: https://git.openjdk.java.net/jdk17u-dev/pull/312