RFR: 8273454: C2: Transform (-a)*(-b) into a*b [v7]

[Zhengyu Gu]

On Fri, 17 Sep 2021 07:42:59 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   @TobiHartmann's comments
>
> Thanks for making these changes, looks good to me.

@TobiHartmann @chhagedorn Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/5403