Replaces Location::ToStackSlotAddress() with Location::ToStackSlotOffset()

runtime/vm/assembler_x64.h

Index: runtime/vm/assembler_x64.h
===================================================================
--- runtime/vm/assembler_x64.h	(revision 25072)
+++ runtime/vm/assembler_x64.h	(working copy)
@@ -12,11 +12,13 @@
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/constants_x64.h"
+#include "vm/locations.h"
 
 namespace dart {
 
 // Forward declarations.
 class RuntimeEntry;
+class Location;
 
 class Immediate : public ValueObject {
  public:
@@ -91,7 +93,7 @@
     return *this;
   }
 
-  bool Equals(const Operand& other) {
+  bool Equals(const Operand& other) const {
     if (length_ != other.length_) return false;
     if (rex_ != other.rex_) return false;
     for (uint8_t i = 0; i < length_; i++) {
@@ -208,6 +210,8 @@
 
   Address(const Address& other) : Operand(other) { }
 
+  static Address StackSlotAddress(const Location& stack_slot);
+
   Address& operator=(const Address& other) {
     Operand::operator=(other);
     return *this;