8317678: Fix up hashCode() for ZipFile.Source.Key

[rm-gh-8]

Backporting JDK-8317678: Fix up hashCode() for ZipFile.Source.Key. Fixes the hashCode() implementation and adds a new benchmark test. Ran GHA Sanity Checks (passed), related zip tests (passed) and the new benchmark test (executed properly). The merge conflict was due to the missing benchmark test file, which is in this PR.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8317678 needs maintainer approval

Issue

• JDK-8317678: Fix up hashCode() for ZipFile.Source.Key (Bug - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/4169/head:pull/4169
$ git checkout pull/4169

Update a local copy of the PR:
$ git checkout pull/4169
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/4169/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 4169

View PR using the GUI difftool:
$ git pr show -t 4169

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/4169.diff

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[openjdk]

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See the Progress checklist in the description for automated requirements.

[openjdk]

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