8287432: C2: assert(tn->in(0) != __null) failed: must have live top node

[TobiHartmann]

Backport of JDK-8287432. Applies cleanly. Approval is pending.

Thanks,
Tobias

---

Progress

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

Issue

• JDK-8287432: C2: assert(tn->in(0) != __null) failed: must have live top node

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk18u pull/165/head:pull/165
$ git checkout pull/165

Update a local copy of the PR:
$ git checkout pull/165
$ git pull https://git.openjdk.org/jdk18u pull/165/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 165

View PR using the GUI difftool:
$ git pr show -t 165

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk18u/pull/165.diff

[bridgekeeper]

👋 Welcome back thartmann! 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]

@TobiHartmann 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:

8287432: C2: assert(tn->in(0) != __null) failed: must have live top node

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[mlbridge]

Webrevs

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