RFR: 8278037: Clean up PPC32 related code in C1 [v3]

[Ao Qi]

On Wed, 1 Dec 2021 18:01:41 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Ao Qi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   missing ")"
>
> I appreciate to see this go away. Thanks!

@TheRealMDoerr, thanks!

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PR: https://git.openjdk.java.net/jdk/pull/6625