8343426: ConcurrentSkipListMap.spliterator() can no longer split the stream

[satyenme]

Backporting JDK-8344253: Test java/util/Spliterator/SpliteratorTraversingAndSplittingTest.java failed. Fixes an intermittent failure with the java/util/Spliterator/SpliteratorTraversingAndSplittingTest.java failed test in situations where a decrement wouldn't complete, since unsigned shift right twice would lead to decrementing estimated size by 0. Backporting alongside the related issue: JDK-8344253: openjdk/jdk21u-dev#1895. Ran GHA Sanity Checks, and local Tier 1 and 2. Patch is clean.

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Progress

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Issue

• JDK-8343426: ConcurrentSkipListMap.spliterator() can no longer split the stream (Bug - P3 - Requested)

Reviewing

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[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
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[openjdk]

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

[mlbridge]

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• 00: Full (a1c3e8cf)