X64: Change some fpu operations to use XMM registers.

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index 1bddea4bf65241af0d1d8c847270dac62e66e402..407863f697ad183caff8a21a1e685ca6de9a1dd6 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -1110,6 +1110,9 @@ class Assembler : public Malloced {
   void movsd(XMMRegister dst, XMMRegister src);
   void movsd(XMMRegister dst, const Operand& src);
 
+  void movss(XMMRegister dst, const Operand& src);
+  void movss(const Operand& dst, XMMRegister src);
+
   void cvttss2si(Register dst, const Operand& src);
   void cvttsd2si(Register dst, const Operand& src);
   void cvttsd2siq(Register dst, XMMRegister src);
@@ -1119,7 +1122,11 @@ class Assembler : public Malloced {
   void cvtqsi2sd(XMMRegister dst, const Operand& src);
   void cvtqsi2sd(XMMRegister dst, Register src);
 
+  void cvtlsi2ss(XMMRegister dst, Register src);
+
   void cvtss2sd(XMMRegister dst, XMMRegister src);
+  void cvtss2sd(XMMRegister dst, const Operand& src);
+  void cvtsd2ss(XMMRegister dst, XMMRegister src);
 
   void addsd(XMMRegister dst, XMMRegister src);
   void subsd(XMMRegister dst, XMMRegister src);
@@ -1130,6 +1137,7 @@ class Assembler : public Malloced {
   void sqrtsd(XMMRegister dst, XMMRegister src);
 
   void ucomisd(XMMRegister dst, XMMRegister src);
+  void ucomisd(XMMRegister dst, const Operand& src);
 
   // The first argument is the reg field, the second argument is the r/m field.
   void emit_sse_operand(XMMRegister dst, XMMRegister src);