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

[GoeLin]

I backport this for parity with 17.0.7-oracle.

---

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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.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

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

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[mlbridge]

Webrevs

• 00: Full (50fe0df4)

[GoeLin]

/integrate

[openjdk]

Going to push as commit aa8a841.
Since your change was applied there have been 12 commits pushed to the master branch:

• 61e27b4: 8292780: misc tests failed "assert(false) failed: graph should be schedulable"
• 43668f9: 8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop
• 330105c: 8292602: ZGC: C2 late barrier analysis uses invalid dominator information
• 4be52ee: 8292297: Fix up loading of override java.security properties file
• 475ca04: 8281122: [IR Framework] Cleanup IR matching code in preparation for JDK-8280378
• d667e32: 8280889: java/lang/instrument/GetObjectSizeIntrinsicsTest.java fails with -XX:-UseCompressedOops
• 587d5c5: 8280166: Extend java/lang/instrument/GetObjectSizeIntrinsicsTest.java test cases
• 410fa44: 8258512: serviceability/sa/TestJmapCore.java timed out on macOS 10.13.6
• eb76fa3: 8270156: Add "randomness" and "stress" keys to JTreg tests which use StressGCM, StressLCM and/or StressIGVN
• cfb3a3c: 8235297: sun/security/ssl/SSLSessionImpl/ResumptionUpdateBoundValues.java fails intermittent
• ... and 2 more: https://git.openjdk.org/jdk17u-dev/compare/633a763b3793f4f83cea2c3990f35c6b081582fd...master

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit aa8a841.

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