RFR: 8369979: Flag UsePopCountInstruction was accidentally disabled on PPC64

[Andrew Haley]

On Thu, 16 Oct 2025 10:01:13 GMT, David Briemann <dbriemann at openjdk.org> wrote:

> Reenables the flag UsePopCountInstruction for PPC in `src/hotspot/cpu/ppc/vm_version_ppc.cpp` to reactivate the support for popcount intrinsics on PPC.

Oops.

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Marked as reviewed by aph (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27843#pullrequestreview-3344075690