8301491: C2: java.lang.StringUTF16::indexOfChar intrinsic called with negative character argument

[GoeLin]

I backport this for parity with 17.0.8-oracle.

---

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Issue

• JDK-8301491: C2: java.lang.StringUTF16::indexOfChar intrinsic called with negative character argument

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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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After integration, the commit message for the final commit will be:

8301491: C2: java.lang.StringUTF16::indexOfChar intrinsic called with negative character argument

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[mlbridge]

Webrevs

• 00: Full (f2e9c1df)

[GoeLin]

/integrate

[openjdk]

Going to push as commit 48632e5.
Since your change was applied there have been 5 commits pushed to the master branch:

• 52324b5: 8300079: SIGSEGV in LibraryCallKit::inline_string_copy due to constant NULL src argument
• ac823d3: 8306664: GHA: Update MSVC version to latest stepping
• da740fa: 8302595: use-after-free related to GraphKit::clone_map
• 790802b: 8293858: Change PKCS7 code to use default SecureRandom impl instead of SHA1PRNG
• 394a756: 8254711: Add java.security.Provider.getService JFR Event

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit 48632e5.

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