[jdk21u] RFR: 8301489: C1: ShortLoopOptimizer might lift instructions before their inputs

Fri Sep 22 13:28:55 UTC 2023

I backport this for parity with 17.0.10-oracle.

I think the 21 deferral labeled in the JBS issue is overcome, as the change isn't that new any more and it has been backported to 17, which has much more exposure than the 21 update will have.

Clean backport, test passes, will run through SAP testing that among others runs all headless jtreg tests on most platforms.

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Commit messages:
 - Backport 73d7aa1d2cb037fed69263a1990258866333664d

Changes: https://git.openjdk.org/jdk21u/pull/193/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=193&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301489
  Stats: 144 lines in 2 files changed: 143 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/193.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/193/head:pull/193

PR: https://git.openjdk.org/jdk21u/pull/193