RFR: 8282470: Eliminate useless sign extension before some subword integer operations [v2]

[Fei Gao]

On Wed, 25 May 2022 17:14:46 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> @fg1417 Thank you for proposing these changes. I hope you still want to proceed with it.

I updated the patch to latest JDK. Could you please help review it, @vnkozlov ? Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/7954