Add popcnt instruction and use it in logcount vop if :sse3 is a
feature. * src/compiler/x86/arith.lisp * Add vop for logcount that uses popcnt instruction. * src/compiler/x86/insts.lisp * Define popcnt instruction (but only for :sse3) * src/general-info/release-20d.txt: * Update.
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c4379fd5
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