Add inline caching for keyed loads and stores. Remove extra parentheses from...

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
===================================================================
--- src/x64/assembler-x64.h	(revision 2533)
+++ src/x64/assembler-x64.h	(working copy)
@@ -627,6 +627,7 @@
 
   void decq(Register dst);
   void decq(const Operand& dst);
+  void decl(Register dst);
   void decl(const Operand& dst);
 
   // Sign-extends rax into rdx:rax.
@@ -737,6 +738,10 @@
     shift_32(dst, 0x5);
   }
 
+  void shrl(Register dst, Immediate shift_amount) {
+    shift_32(dst, shift_amount, 0x5);
+  }
+
   void store_rax(void* dst, RelocInfo::Mode mode);
   void store_rax(ExternalReference ref);