RFR: 8286104: use aggressive liveness for unstable_if traps [v7]

[Xin Liu]

On Wed, 1 Jun 2022 19:32:04 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove useless flag. if jdwp is on, liveness_at_bci() marks all local
>>   variables live.
>
> test/hotspot/jtreg/compiler/c2/irTests/TestAggressiveLivenessForUnstableIf.java line 2:
> 
>> 1: /*
>> 2:  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
> 
> Missing year.

I was told (by the company's open-source policy) to write a header like this.  I guess they just want to reduce chore of maintaining years.  This also consistent with other code we contributed.

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PR: https://git.openjdk.java.net/jdk/pull/8545