8386591: C2: wrong result because of broken truncation check in CountedLoopConverter::TruncatedIncrement::build

[eme64]

The third bug covered by #31501.

TODO

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed (2 reviews required, with at least 1 Reviewer, 1 Author)

Issue

• JDK-8386591: C2: wrong result because of broken truncation check in CountedLoopConverter::TruncatedIncrement::build (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/31502/head:pull/31502
$ git checkout pull/31502

Update a local copy of the PR:
$ git checkout pull/31502
$ git pull https://git.openjdk.org/jdk.git pull/31502/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 31502

View PR using the GUI difftool:
$ git pr show -t 31502

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/31502.diff

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[openjdk]

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