[x64] Implement vsqrtsd AVX instruction.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index df010e04fd1033a445e0dc8e2993bc7257bc4b92..599e4034094b644001d80efed3ba63b8cbcd25c1 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2669,6 +2669,26 @@ void MacroAssembler::Movmskpd(Register dst, XMMRegister src) {
 }
 
 
+void MacroAssembler::Sqrtsd(XMMRegister dst, XMMRegister src) {
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope scope(this, AVX);
+    vsqrtsd(dst, dst, src);
+  } else {
+    sqrtsd(dst, src);
+  }
+}
+
+
+void MacroAssembler::Sqrtsd(XMMRegister dst, const Operand& src) {
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope scope(this, AVX);
+    vsqrtsd(dst, dst, src);
+  } else {
+    sqrtsd(dst, src);
+  }
+}
+
+
 void MacroAssembler::Ucomiss(XMMRegister src1, XMMRegister src2) {
   if (CpuFeatures::IsSupported(AVX)) {
     CpuFeatureScope scope(this, AVX);