[jdk17u-dev] RFR: 8271471: [IR Framework] Rare occurrence of "<!-- safepoint while printing -->" in PrintIdeal/PrintOptoAssembly can let tests fail

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

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Commit messages:
 - Backport 3677734584859e1b4bea65f6719e839f949c9236

Changes: https://git.openjdk.org/jdk17u-dev/pull/969/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=969&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8271471
  Stats: 102 lines in 5 files changed: 78 ins; 11 del; 13 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/969.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/969/head:pull/969

PR: https://git.openjdk.org/jdk17u-dev/pull/969