[mips][Liftoff] Implement i64 popcnt
port d710756a https://crrev.com/c/1895569 Original Commit Message: [Liftoff] Implement i64 popcnt This is the last remaining missing instruction from the MVP. This CL adds support for ia32, x64, arm, and arm64. For CPUs which do not support the POPCNT instruction, there exists a fallback implementation in C. Change-Id: I2ebc7bc93c2a915f21139248ac1234146a1e8cb9 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1902887 Auto-Submit: Zhao Jiazhong <kyslie3100@gmail.com> Reviewed-by: Clemens Backes <clemensb@chromium.org> Commit-Queue: Clemens Backes <clemensb@chromium.org> Cr-Commit-Position: refs/heads/master@{#64827}
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