Move movq(Register, ExternalReference) into X64 MacroAssembler

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 df0ac5d394796da80698a85ba7e1495ce0978c93..1bf50e7c27698d9a591d821aefa25a6c68b23eea 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -319,7 +319,7 @@ class MacroAssembler: public Assembler {
   void InitializeRootRegister() {
     ExternalReference roots_array_start =
         ExternalReference::roots_array_start(isolate());
-    movq(kRootRegister, roots_array_start);
+    Move(kRootRegister, roots_array_start);
     addq(kRootRegister, Immediate(kRootRegisterBias));
   }
 
@@ -829,6 +829,10 @@ class MacroAssembler: public Assembler {
   void Pop(Register dst) { pop(dst); }
   void PushReturnAddressFrom(Register src) { push(src); }
   void PopReturnAddressTo(Register dst) { pop(dst); }
+  void Move(Register dst, ExternalReference ext) {
+    movq(dst, reinterpret_cast<Address>(ext.address()),
+         RelocInfo::EXTERNAL_REFERENCE);
+  }
 
   // Control Flow
   void Jump(Address destination, RelocInfo::Mode rmode);