Return int64_t instead of intptr_t for RootRegisterDelta and support x32 as well.

src/x64/macro-assembler-x64.h

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1447 matching lines @@
   static const int kSmiShift = kSmiTagSize + kSmiShiftSize;
 
   bool generating_stub_;
   bool has_frame_;
   bool root_array_available_;
 
   // Returns a register holding the smi value. The register MUST NOT be
   // modified. It may be the "smi 1 constant" register.
   Register GetSmiConstant(Smi* value);
 
-  intptr_t RootRegisterDelta(ExternalReference other);
+  int64_t RootRegisterDelta(ExternalReference other);
 
   // Moves the smi value to the destination register.
   void LoadSmiConstant(Register dst, Smi* value);
 
   // This handle will be patched with the code object on installation.
   Handle<Object> code_object_;
 
   // Helper functions for generating invokes.
   void InvokePrologue(const ParameterCount& expected,
                       const ParameterCount& actual,
@@ skipping 145 matching lines @@
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_