Start porting fast typechecks to x64.

runtime/vm/code_generator_ia32.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/code_generator.h"
 
 #include "lib/error.h"
@@ skipping 2399 matching lines @@
   __ addl(ESP, Immediate((node->arguments()->length() + 1) * kWordSize));
   // Restore the context.
   __ popl(CTX);
   // Result is in EAX.
   if (IsResultNeeded(node)) {
     __ pushl(EAX);
   }
 }
 
 
+// Pushes either the instantiator or null.
 // Pushes the type arguments of the instantiator on the stack.
-// Destroys EBX.
+// Destroys EBX, ECX.
 void CodeGenerator::GenerateInstantiatorTypeArguments(intptr_t token_index,
                                                       bool push_instantiator) {
   if (push_instantiator) {
     const Immediate raw_null =
         Immediate(reinterpret_cast<intptr_t>(Object::null()));
     __ pushl(raw_null);  // Initial instantiator.
   }
   const Class& instantiator_class = Class::Handle(
       parsed_function().function().owner());
   if (instantiator_class.NumTypeParameters() == 0) {
@@ skipping 541 matching lines @@
   const Error& error = Error::Handle(
       Parser::FormatError(script, token_index, "Error", format, args));
   va_end(args);
   Isolate::Current()->long_jump_base()->Jump(1, error);
   UNREACHABLE();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32