8297951: C2: Create skeleton predicates for all If nodes in loop predication

[GoeLin]

I backport this for parity with 11.0.19-oracle.

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Progress

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Issue

• JDK-8297951: C2: Create skeleton predicates for all If nodes in loop predication

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev pull/1686/head:pull/1686
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$ git pull https://git.openjdk.org/jdk11u-dev pull/1686/head

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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.

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

8297951: C2: Create skeleton predicates for all If nodes in loop predication

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[mlbridge]

Webrevs

• 00: Full (cb065819)

[GoeLin]

Pre-submit failure. Wants to compile with --source 1.2, which does not work with 11. Strange, but unrelated.

[GoeLin]

/integrate

[openjdk]

Going to push as commit de8c37a.
Since your change was applied there have been 6 commits pushed to the master branch:

• 5b349ea: 8297264: C2: Cast node is not processed again in CCP and keeps a wrong too narrow type which is later replaced by top
• 9ef11ac: 8295788: C2 compilation hits "assert((mode == ControlAroundStripMined && use == sfpt) || !use->is_reachable_from_root()) failed: missed a node"
• f999efd: 8287180: Update IANA Language Subtag Registry to Version 2022-08-08
• d1fb7b2: 8285690: CloneableReference subtest should not throw CloneNotSupportedException
• f4c5bdf: 8272985: Reference discovery is confused about atomicity and degree of parallelism
• e4fdd03: 8209115: adjust libsplashscreen linux ppc64le builds for easier libpng update

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit de8c37a.

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