RFR: 8290432: C2 compilation fails with assert(node->_last_del == _last) failed: must have deleted the edge just produced [v3]

[Yi Yang]

On Wed, 16 Nov 2022 12:25:21 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Yi Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   update comment
>
> test/hotspot/jtreg/compiler/c2/TestUnexpectedParallelIV.java line 28:
> 
>> 26:  * @test
>> 27:  * @bug 8290432
>> 28:  * @summary Unexpected parallel induction variable pattern was recongized
> 
> This test does not reproduce the issue for me, whereas [Test-2.java](https://bugs.openjdk.org/secure/attachment/100710/Test-2.java) still works.

You can reset to JDK-8273585, TestUnexpectedParallelIV.java reproduces the crash. Test-2.java can always reproduce without resetting commits. I added both of them as test cases.

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PR: https://git.openjdk.org/jdk/pull/9695