8297642: PhaseIdealLoop::only_has_infinite_loops must detect all loops that never lead to termination

[GoeLin]

I backport this for parity with 17.0.7-oracle.

---

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Issue

• JDK-8297642: PhaseIdealLoop::only_has_infinite_loops must detect all loops that never lead to termination

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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.

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8297642: PhaseIdealLoop::only_has_infinite_loops must detect all loops that never lead to termination

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[mlbridge]

Webrevs

• 00: Full (c2399915)

[GoeLin]

/integrate

[openjdk]

Going to push as commit 1d6db44.
Since your change was applied there have been 19 commits pushed to the master branch:

• b5c7a6f: 8290850: C2: create_new_if_for_predicate() does not clone pinned phi input nodes resulting in a broken graph
• 127f3eb: 8278961: Enable debug logging in java/net/DatagramSocket/SendDatagramToBadAddress.java
• 044eb4e: 8273154: Provide a JavadocTester method for non-overlapping, unordered output matching
• 5872c77: 8254267: javax/xml/crypto/dsig/LogParameters.java failed with "RuntimeException: Unexpected log output:"
• 7043b63: 8295211: Fix autoconf 2.71 warning "AC_CHECK_HEADERS: you should use literals"
• e490cad: 8279351: [TESTBUG] SADebugDTest.java does not handle "Address already in use" error
• 1032a0f: 8299789: Compilation of gtest causes build to fail if runtime libraries are in different dirs
• 4780e49: 8299424: containers/docker/TestMemoryWithCgroupV1.java fails on SLES12 ppc64le when testing Memory and Swap Limit
• 63da2b0: 8295413: com/sun/jdi/EATests.java fails with compiler flag -XX:+StressReflectiveCode
• 6e544c2: 8299520: TestPrintXML.java output error messages in case compare fails
• ... and 9 more: https://git.openjdk.org/jdk17u-dev/compare/2defeb0e0429a594352beb6b62725181f6b78df3...master

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit 1d6db44.

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