[wasm] Int64Lowering of I64ShrU and I64ShrS on ia32.

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 342ca5c9184af7a116ee0b046ad0ffe5c36af00d..d7828c7bd94341a04fcf0cdc9a6e8c9c9d79c7a4 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -374,8 +374,12 @@ class MacroAssembler: public Assembler {
 
   void Cvtui2ss(XMMRegister dst, Register src, Register tmp);
 
-  void PairShl(Register dst, Register src, uint8_t imm8);
-  void PairShl_cl(Register dst, Register src);
+  void PairShl(Register high, Register low, uint8_t imm8);
+  void PairShl_cl(Register high, Register low);
+  void PairShr(Register high, Register low, uint8_t imm8);
+  void PairShr_cl(Register high, Register src);
+  void PairSar(Register high, Register low, uint8_t imm8);
+  void PairSar_cl(Register high, Register low);
 
   // Support for constant splitting.
   bool IsUnsafeImmediate(const Immediate& x);