8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

[GoeLin]

I backport this for parity with 11.0.19-oracle.

---

Progress

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Issue

• JDK-8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

Reviewing

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[bridgekeeper]

👋 Welcome back goetz! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@GoeLin This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 1 new commit pushed to the master branch:

• 62191cd: 8221621: FindTests.gmk cannot handle "=" in TEST.groups comments

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[mlbridge]

Webrevs

• 00: Full (8237ed39)

[GoeLin]

/integrate

[openjdk]

Going to push as commit e92b7c3.
Since your change was applied there have been 16 commits pushed to the master branch:

• 369dedb: 8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop
• 80eecc5: 8299439: java/text/Format/NumberFormat/CurrencyFormat.java fails for hr_HR
• dfcf7c1: 8256111: Create implementation for NSAccessibilityStaticText protocol
• 06f769a: 8292863: assert(_print_inlining_stream->size() > 0) failed: missing inlining msg
• 1d78ce4: 8221351: Crash in KlassFactory::check_shared_class_file_load_hook
• 3c2763f: 8195716: BootstrapLoggerTest : Executor still alive
• decfc86: 8217353: java/util/logging/LogManager/Configuration/updateConfiguration/HandlersOnComplexResetUpdate.java fails with Unexpected reference: java.lang.ref.WeakReference
• dc5590f: 8213932: [TESTBUG] assertEquals is invoked with the arguments in the wrong order
• 1713cf1: 8215759: [test] java/math/BigInteger/ModPow.java can throw an ArithmeticException
• 13eadde: 8215372: test/jdk/java/nio/file/DirectoryStream/Basic.java not correct when using a glob
• ... and 6 more: https://git.openjdk.org/jdk11u-dev/compare/f9f3fcb9e5fb5050008d72b5c7c37ea4a0ebccfa...master

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit e92b7c3.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.