8357822: C2: Multiple string optimization tests are no longer testing string concatenation optimizations

[rgithubli]

A clean backport for https://bugs.openjdk.org/browse/JDK-8357822.

Backport this for the parity with 21.0.10-oracle.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8357822 needs maintainer approval

Issue

• JDK-8357822: C2: Multiple string optimization tests are no longer testing string concatenation optimizations (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2205/head:pull/2205
$ git checkout pull/2205

Update a local copy of the PR:
$ git checkout pull/2205
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2205/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2205

View PR using the GUI difftool:
$ git pr show -t 2205

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2205.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back rgithubli! 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 change is not yet ready to be integrated.
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.

[openjdk]

⚠️ @rgithubli This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (690792cd)

[rgithubli]

/approval request A clean backport for https://bugs.openjdk.org/browse/JDK-8357822.

Backport this for the parity with 21.0.10-oracle.

[openjdk]

@rgithubli
8357822: The approval request has been created successfully.

[GoeLin]

Hi @rgithubli
please run the tests and say so somewhere, best in the fix request comment.