RFR: 8283187: C2: loop candidate for superword not always unrolled fully if superword fails [v2]

[Roland Westrelin]

On Wed, 23 Mar 2022 07:42:59 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> This fixes the issue:
> 
> ```
> - * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI compiler.c2.irTests.TestSuperwordFailsUnrolling
> + * @run main/othervm -Xbootclasspath/a:. -DSkipWhiteBoxInstall=true -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI compiler.c2.irTests.TestSuperwordFailsUnrolling
> ```

New commit has this change

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PR: https://git.openjdk.java.net/jdk/pull/7822