[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 aefc53f8a2fcaa7ac00ca7c9392a4c0b06808f89..75f6e3ea6afcc39d38f40c8579404d1fa872faf8 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -826,8 +826,12 @@ class MacroAssembler: public Assembler {
   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);