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

[GoeLin]

I backport this for parity with 17.0.5-oracle.

---

Progress

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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/jdk17u-dev pull/515/head:pull/515
$ git checkout pull/515

Update a local copy of the PR:
$ git checkout pull/515
$ git pull https://git.openjdk.org/jdk17u-dev pull/515/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 515

View PR using the GUI difftool:
$ git pr show -t 515

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/515.diff

[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.

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

• 00: Full (4029f217)

[GoeLin]

/integrate

[openjdk]

Going to push as commit d3354af.
Since your change was applied there have been 9 commits pushed to the master branch:

• f73037d: 8286625: C2 fails with assert(!n->is_Store() && !n->is_LoadStore()) failed: no node with a side effect
• 7f40f16: 8278067: Make HttpURLConnection default keep alive timeout configurable
• 774213f: 8256844: Make NMT late-initializable
• 437c634: 8281181: Do not use CPU Shares to compute active processor count
• 180f3d9: 8284944: assert(cnt++ < 40) failed: infinite cycle in loop optimization
• 23fc860: 8284294: Create an automated regression test for RFE 4138746
• b0af5e5: 8282936: Write a regression test for JDK-4615365
• 4c96224: 8288467: remove memory_operand assert for spilled instructions
• 201dad4: 8287396: LIR_Opr::vreg_number() and data() can return negative number

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit d3354af.

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