RFR: 8178348: left_n_bits(0) invokes undefined behavior

[David Holmes]

On Thu, 11 Mar 2021 18:22:33 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

> Please review this small change to remove the unused left_n_bits(n) macro.  This change was regression tested with Mach5 tiers 1 and 2 on Linux, Windows, and Mac OS.
> 
> Thanks, Harold

If it is unused and broken then removing seems fine.

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2944