Revert of [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 11c52d5dffff951728b75bb329eeb93aa79ba869..83a5b9157e357259605cc810ff019a6a041eeb69 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -831,12 +831,8 @@
   void Cvttsd2si(Register dst, const Operand& src);
   void Cvttss2siq(Register dst, XMMRegister src);
   void Cvttss2siq(Register dst, const Operand& src);
-  void Cvtss2siq(Register dst, XMMRegister src);
-  void Cvtss2siq(Register dst, const Operand& src);
   void Cvttsd2siq(Register dst, XMMRegister src);
   void Cvttsd2siq(Register dst, const Operand& src);
-  void Cvtsd2siq(Register dst, XMMRegister src);
-  void Cvtsd2siq(Register dst, const Operand& src);
 
   // Move if the registers are not identical.
   void Move(Register target, Register source);
@@ -971,11 +967,7 @@
   void Movmskpd(Register dst, XMMRegister src);
 
   void Roundss(XMMRegister dst, XMMRegister src, RoundingMode mode);
-  void Roundss(XMMRegister dst, XMMRegister src, Register tmp,
-               RoundingMode mode);
   void Roundsd(XMMRegister dst, XMMRegister src, RoundingMode mode);
-  void Roundsd(XMMRegister dst, XMMRegister src, Register tmp,
-               RoundingMode mode);
   void Sqrtsd(XMMRegister dst, XMMRegister src);
   void Sqrtsd(XMMRegister dst, const Operand& src);