X64: Obey WIN64 ABI more exactly, in WIN64 build.

src/x64/codegen-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 6935 matching lines @@
   ExternalReference scope_depth =
       ExternalReference::heap_always_allocate_scope_depth();
   if (always_allocate_scope) {
     __ movq(kScratchRegister, scope_depth);
     __ incl(Operand(kScratchRegister, 0));
   }
 
   // Call C function.
 #ifdef _WIN64
   // Windows 64-bit ABI passes arguments in rcx, rdx, r8, r9
-  // Store Arguments object on stack
-  __ movq(Operand(rsp, 1 * kPointerSize), r14);  // argc.
-  __ movq(Operand(rsp, 2 * kPointerSize), r15);  // argv.
+  // Store Arguments object on stack, below the 4 WIN64 ABI parameter slots.
+  __ movq(Operand(rsp, 4 * kPointerSize), r14);  // argc.
+  __ movq(Operand(rsp, 5 * kPointerSize), r15);  // argv.
   // Pass a pointer to the Arguments object as the first argument.
-  __ lea(rcx, Operand(rsp, 1 * kPointerSize));
+  __ lea(rcx, Operand(rsp, 4 * kPointerSize));
 #else  // ! defined(_WIN64)
   // GCC passes arguments in rdi, rsi, rdx, rcx, r8, r9.
   __ movq(rdi, r14);  // argc.
   __ movq(rsi, r15);  // argv.
 #endif
   __ call(rbx);
   // Result is in rax - do not destroy this register!
 
   if (always_allocate_scope) {
     __ movq(kScratchRegister, scope_depth);
@@ skipping 893 matching lines @@
 int CompareStub::MinorKey() {
   // Encode the two parameters in a unique 16 bit value.
   ASSERT(static_cast<unsigned>(cc_) < (1 << 15));
   return (static_cast<unsigned>(cc_) << 1) | (strict_ ? 1 : 0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal