X64: Adding macro to load double from memory, and use SSE3 instruction if present.

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
diff --git a/src/x64/codegen-x64.cc b/src/x64/codegen-x64.cc
index f8f2d6e687896f4150e9a3068dbb280693cce6c9..4af3d7bd9f985b984e7fe89890c61a968506d6f9 100644
--- a/src/x64/codegen-x64.cc
+++ b/src/x64/codegen-x64.cc
@@ -110,13 +110,13 @@ ModuloFunction CreateModuloFunction() {
   int64_t kNaNValue = V8_INT64_C(0x7ff8000000000000);
   __ movq(rcx, kNaNValue, RelocInfo::NONE);
   __ movq(Operand(rsp, kPointerSize), rcx);
-  __ movsd(xmm0, Operand(rsp, kPointerSize));
+  __ LoadDbl(xmm0, Operand(rsp, kPointerSize));
   __ jmp(&return_result);
 
   // If result is valid, return that.
   __ bind(&valid_result);
   __ fstp_d(Operand(rsp, kPointerSize));
-  __ movsd(xmm0, Operand(rsp, kPointerSize));
+  __ LoadDbl(xmm0, Operand(rsp, kPointerSize));
 
   // Clean up FPU stack and exceptions and return xmm0
   __ bind(&return_result);