X64: Create test JS-function and call it.

src/x64/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 63 matching lines @@
 
 
 Operand::Operand(Register base, int32_t disp): rex_(0) {
   len_ = 1;
   if (base.is(rsp) || base.is(r12)) {
     // SIB byte is needed to encode (rsp + offset) or (r12 + offset).
     set_sib(kTimes1, rsp, base);
   }
 
   if (disp == 0 && !base.is(rbp) && !base.is(r13)) {
-    set_modrm(0, rsp);
+    set_modrm(0, base);
   } else if (is_int8(disp)) {
     set_modrm(1, base);
     set_disp8(disp);
   } else {
     set_modrm(2, base);
     set_disp32(disp);
   }
 }
 
 
@@ skipping 1596 matching lines @@
   UNIMPLEMENTED();
   return NULL;
 }
 
 byte* JavaScriptFrame::GetCallerStackPointer() const {
   UNIMPLEMENTED();
   return NULL;
 }
 
 } }  // namespace v8::internal