8279622: C2: miscompilation of map pattern as a vector reduction

[GoeLin]

I backport this for parity with 17.0.5-oracle.

I had to resolve superword.cpp.
Only adding an assertions there, context differs.

---

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Issue

• JDK-8279622: C2: miscompilation of map pattern as a vector reduction

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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.

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:

8279622: C2: miscompilation of map pattern as a vector reduction

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At the time when this comment was updated there had been 3 new commits pushed to the master branch:

• 1584ddc: 8282778: Create a regression test for JDK-4699544
• 4d92532: 8285380: Fix typos in security
• f1d3fa9: 8287113: JFR: Periodic task thread uses period for method sampling events

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
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[mlbridge]

Webrevs

• 00: Full (4b9a0132)

[GoeLin]

/integrate

[openjdk]

Going to push as commit 47e478d.
Since your change was applied there have been 19 commits pushed to the master branch:

• d90fd6f: 8282937: Write a regression test for JDK-4820080
• 270a474: 8211002: test/jdk/java/lang/Math/PowTests.java skips testing for non-corner-case values
• 6f0f842: 8286582: Build fails on macos aarch64 when using --with-zlib=bundled
• 68456bb: 8288754: GCC 12 fails to build zReferenceProcessor.cpp
• 72603ff: 8288303: C1: Miscompilation due to broken Class.getModifiers intrinsic
• a2be28d: 8283457: [macos] libpng build failures with Xcode13.3
• a411085: 8285081: Improve XPath operators count accuracy
• 4403118: 8286211: Update PCSC-Lite for Suse Linux to 1.9.5
• b7d808e: 8284367: JQuery UI upgrade from 1.12.1 to 1.13.1
• c1e544f: 8286638: C2: CmpU needs to do more precise over/underflow analysis
• ... and 9 more: https://git.openjdk.org/jdk17u-dev/compare/50c0080689d7971162669d72cf5e21cfd3bc2321...master

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit 47e478d.

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