X64: Fix bug in left-shift.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 672 matching lines @@
 
   // Shifts src:dst right by cl bits, affecting only dst.
   void shrd(Register dst, Register src);
 
   // Shifts dst right, duplicating sign bit, by shift_amount bits.
   // Shifting by 1 is handled efficiently.
   void sar(Register dst, Immediate shift_amount) {
     shift(dst, shift_amount, 0x7);
   }
 
+  // Shifts dst right, duplicating sign bit, by shift_amount bits.
+  // Shifting by 1 is handled efficiently.
+  void sarl(Register dst, Immediate shift_amount) {
+    shift_32(dst, shift_amount, 0x7);
+  }
+
   // Shifts dst right, duplicating sign bit, by cl % 64 bits.
   void sar(Register dst) {
     shift(dst, 0x7);
   }
 
+  // Shifts dst right, duplicating sign bit, by cl % 64 bits.
+  void sarl(Register dst) {
+    shift_32(dst, 0x7);
+  }
+
   void shl(Register dst, Immediate shift_amount) {
     shift(dst, shift_amount, 0x4);
   }
 
   void shl(Register dst) {
     shift(dst, 0x4);
   }
 
   void shll(Register dst) {
     shift_32(dst, 0x4);
@@ skipping 408 matching lines @@
                                   Immediate src);
   // Operate on a byte in memory or register.
   void immediate_arithmetic_op_8(byte subcode,
                                  const Operand& dst,
                                  Immediate src);
   void immediate_arithmetic_op_8(byte subcode,
                                  Register dst,
                                  Immediate src);
   // Emit machine code for a shift operation.
   void shift(Register dst, Immediate shift_amount, int subcode);
+  void shift_32(Register dst, Immediate shift_amount, int subcode);
   // Shift dst by cl % 64 bits.
   void shift(Register dst, int subcode);
   void shift_32(Register dst, int subcode);
 
   void emit_farith(int b1, int b2, int i);
 
   // labels
   // void print(Label* L);
   void bind_to(Label* L, int pos);
   void link_to(Label* L, Label* appendix);
@@ skipping 51 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_