X64: Added implementations of Set(..., Immediate) to macro assembler.

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 67c7bdd30864ae455b02d61f2d45a9aac8d6c712..24c9753b0bf3e60f05e92120fb6a10c2c5aac086 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -33,6 +33,8 @@
 namespace v8 {
 namespace internal {
 
+static const Register kScratchRegister = r10;
+
 // Forward declaration.
 class JumpTarget;
 
@@ -137,8 +139,8 @@ class MacroAssembler: public Assembler {
   void GetBuiltinEntry(Register target, Builtins::JavaScript id);
 
   // Expression support
-  void Set(Register dst, const Immediate& x);
-  void Set(const Operand& dst, const Immediate& x);
+  void Set(Register dst, int64_t x);
+  void Set(Operand& dst, int64_t x);
 
   // Compare object type for heap object.
   // Incoming register is heap_object and outgoing register is map.