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}