Revert of [x64] Use vcvtlsi2sd when AVX is enabled

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 770 matching lines @@
   for (int i = kNumberOfSavedRegs - 1; i >= 0; i--) {
     Register reg = saved_regs[i];
     if (!reg.is(exclusion1) && !reg.is(exclusion2) && !reg.is(exclusion3)) {
       popq(reg);
     }
   }
 }
 
 
 void MacroAssembler::Cvtlsi2sd(XMMRegister dst, Register src) {
-  if (CpuFeatures::IsSupported(AVX)) {
-    CpuFeatureScope scope(this, AVX);
-    vxorpd(dst, dst, dst);
-    vcvtlsi2sd(dst, dst, src);
-  } else {
-    xorps(dst, dst);
-    cvtlsi2sd(dst, src);
-  }
+  xorps(dst, dst);
+  cvtlsi2sd(dst, src);
 }
 
 
 void MacroAssembler::Cvtlsi2sd(XMMRegister dst, const Operand& src) {
-  if (CpuFeatures::IsSupported(AVX)) {
-    CpuFeatureScope scope(this, AVX);
-    vxorpd(dst, dst, dst);
-    vcvtlsi2sd(dst, dst, src);
-  } else {
-    xorps(dst, dst);
-    cvtlsi2sd(dst, src);
-  }
+  xorps(dst, dst);
+  cvtlsi2sd(dst, src);
 }
 
 
 void MacroAssembler::Load(Register dst, const Operand& src, Representation r) {
   DCHECK(!r.IsDouble());
   if (r.IsInteger8()) {
     movsxbq(dst, src);
   } else if (r.IsUInteger8()) {
     movzxbl(dst, src);
   } else if (r.IsInteger16()) {
@@ skipping 4232 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64