Rollback trunk to 3.21.15.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index d8136924463574bc154996a252085aa5f67bf94b..e4e4533bf5f8e2f4b2b66360ba166666353ad130 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -366,12 +366,6 @@ class MacroAssembler: public Assembler {
   void Set(Register dst, const Immediate& x);
   void Set(const Operand& dst, const Immediate& x);
 
-  // cvtsi2sd instruction only writes to the low 64-bit of dst register, which
-  // hinders register renaming and makes dependence chains longer. So we use
-  // xorps to clear the dst register before cvtsi2sd to solve this issue.
-  void Cvtsi2sd(XMMRegister dst, Register src) { Cvtsi2sd(dst, Operand(src)); }
-  void Cvtsi2sd(XMMRegister dst, const Operand& src);
-
   // Support for constant splitting.
   bool IsUnsafeImmediate(const Immediate& x);
   void SafeSet(Register dst, const Immediate& x);