X64: Small changes to let WIN64 platform compile.

src/x64/macro-assembler-x64.cc

 // Copyright 2009 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 976 matching lines @@
     // TODO(1243899): This should be symmetric to
     // CopyRegistersFromStackToMemory() but it isn't! esp is assumed
     // correct here, but computed for the other call. Very error
     // prone! FIX THIS.  Actually there are deeper problems with
     // register saving than this asymmetry (see the bug report
     // associated with this issue).
     PushRegistersFromMemory(kJSCallerSaved);
   }
 #endif
 
-  // Reserve space for two arguments: argc and argv
-  subq(rsp, Immediate(2 * kPointerSize));
+  // Reserve space for the Arguments object.  The Windows 64-bit ABI
+  // requires us to pass this structure as a pointer to its location on
+  // the stack.  We also need backing space for the pointer, even though
+  // it is passed in a register.
+  subq(rsp, Immediate(3 * kPointerSize));
 
   // Get the required frame alignment for the OS.
   static const int kFrameAlignment = OS::ActivationFrameAlignment();
   if (kFrameAlignment > 0) {
     ASSERT(IsPowerOf2(kFrameAlignment));
     movq(kScratchRegister, Immediate(-kFrameAlignment));
     and_(rsp, kScratchRegister);
   }
 
   // Patch the saved entry sp.
@@ skipping 186 matching lines @@
                      Context::SECURITY_TOKEN_INDEX * kPointerSize;
   movq(scratch, FieldOperand(scratch, token_offset));
   cmpq(scratch, FieldOperand(kScratchRegister, token_offset));
   j(not_equal, miss);
 
   bind(&same_contexts);
 }
 
 
 } }  // namespace v8::internal