8283408: Fix a C2 crash when filling arrays with unsafe

[TheRealMDoerr]

Clean backport of JDK-8283408

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8283408: Fix a C2 crash when filling arrays with unsafe

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk17u-dev pull/306/head:pull/306
$ git checkout pull/306

Update a local copy of the PR:
$ git checkout pull/306
$ git pull https://git.openjdk.java.net/jdk17u-dev pull/306/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 306

View PR using the GUI difftool:
$ git pr show -t 306

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk17u-dev/pull/306.diff

[bridgekeeper]

👋 Welcome back mdoerr! 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]

@TheRealMDoerr This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

8283408: Fix a C2 crash when filling arrays with unsafe

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[mlbridge]

Webrevs

• 00: Full (a46cf192)

[TheRealMDoerr]

/integrate

[openjdk]

Going to push as commit 9c3124a.
Since your change was applied there have been 14 commits pushed to the master branch:

• 3127e4c: 8282172: CompileBroker::log_metaspace_failure is called from non-Java/compiler threads
• e2f6bb8: 8280867: Cpuid1Ecx feature parsing is incorrect for AMD CPUs
• bf88ff1: 8280600: C2: assert(!had_error) failed: bad dominance
• 02292c5: 8271055: Crash during deoptimization with "assert(bb->is_reachable()) failed: getting result from unreachable basicblock" with -XX:+VerifyStack
• 76402bc: 8280964: [Linux aarch64] : drawImage dithers TYPE_BYTE_INDEXED images incorrectly
• 2f39462: 8272358: Some tests may fail when executed with other locales than the US
• a9c2a50: 8277055: Assert "missing inlining msg" with -XX:+PrintIntrinsics
• 0200d64: 8264605: vmTestbase/nsk/jvmti/SuspendThread/suspendthrd003/TestDescription.java failed with "agent_tools.cpp, 471: (foundThread = (jthread) jni_env->NewGlobalRef(foundThread)) != NULL"
• 373526a: 8279219: [REDO] C2 crash when allocating array of size too large
• 6eaf579: 8281544: assert(VM_Version::supports_avx512bw()) failed for Tests jdk/incubator/vector/
• ... and 4 more: https://git.openjdk.java.net/jdk17u-dev/compare/7e41d8439305a9966d968c51480df1623c50cbb2...master

Your commit was automatically rebased without conflicts.

[openjdk]

@TheRealMDoerr Pushed as commit 9c3124a.

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