PPC/s390: [Liftoff] Implement i64 popcnt
Port d710756a Original Commit Message: 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. R=clemensb@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com BUG= LOG=N Change-Id: I8965f4312c5e8ac6510c754772ba3d60394dfc4a Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1899908Reviewed-by: Junliang Yan <jyan@ca.ibm.com> Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com> Cr-Commit-Position: refs/heads/master@{#64778}
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