RFR: 8283694: Improve bit manipulation and boolean to integer conversion operations on x86_64 [v4]

[Ioi Lam]

On Sun, 27 Mar 2022 01:42:50 GMT, Quan Anh Mai <duke at openjdk.java.net> wrote:

> I have adjusted the title to be more specific and accurate. Thank you very much.

Thanks for fixing the title. I am not familiar with the code so I'll let others review it.

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PR: https://git.openjdk.java.net/jdk/pull/7968