Implemented the Word64Popcnt TurboFan operator for x64.

src/x64/macro-assembler-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 3249 matching lines @@
 void MacroAssembler::Popcntl(Register dst, const Operand& src) {
   if (CpuFeatures::IsSupported(POPCNT)) {
     CpuFeatureScope scope(this, POPCNT);
     popcntl(dst, src);
     return;
   }
   UNREACHABLE();
 }
 
 
+void MacroAssembler::Popcntq(Register dst, Register src) {
+  if (CpuFeatures::IsSupported(POPCNT)) {
+    CpuFeatureScope scope(this, POPCNT);
+    popcntq(dst, src);
+    return;
+  }
+  UNREACHABLE();
+}
+
+
+void MacroAssembler::Popcntq(Register dst, const Operand& src) {
+  if (CpuFeatures::IsSupported(POPCNT)) {
+    CpuFeatureScope scope(this, POPCNT);
+    popcntq(dst, src);
+    return;
+  }
+  UNREACHABLE();
+}
+
+
 void MacroAssembler::Pushad() {
   Push(rax);
   Push(rcx);
   Push(rdx);
   Push(rbx);
   // Not pushing rsp or rbp.
   Push(rsi);
   Push(rdi);
   Push(r8);
   Push(r9);
@@ skipping 2152 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64