Implement two-argument check inline cache.

vm/stub_code.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_STUB_CODE_H_
 #define VM_STUB_CODE_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 
@@ skipping 28 matching lines @@
 // allocated in the VM isolate and shared across all isolates.
 // However, in cases where a simple GC-safe placeholder is needed on the stack,
 // using Smi 0 instead of Object::null() is slightly more efficient, since a Smi
 // does not require relocation.
 
 // List of stubs created per isolate, these stubs could potentially contain
 // embedded objects and hence cannot be shared across isolates.
 #define STUB_CODE_LIST(V)                                                      \
   V(InvokeDartCode)                                                            \
   V(AllocateContext)                                                           \
-  V(InlineCache)                                                               \
+  V(OneArgCheckInlineCache)                                                    \
+  V(TwoArgsCheckInlineCache)                                                   \
   V(BreakpointDynamic)                                                         \
 
 
 // class StubEntry is used to describe stub methods generated in dart to
 // abstract out common code executed from generated dart code.
 class StubEntry {
  public:
   StubEntry(const char* name, const Code& code);
   ~StubEntry() {}
 
@@ skipping 106 matching lines @@
 
   // Generate the stub and finalize the generated code into the stub
   // code executable area.
   static RawCode* Generate(const char* name,
                            void (*GenerateStub)(Assembler* assembler));
 
   static void GenerateAllocationStubForClass(Assembler* assembler,
                                              const Class& cls);
   static void GenerateAllocationStubForClosure(Assembler* assembler,
                                                const Function& func);
+  static void GenerateNArgsCheckInlineCacheStub(Assembler* assembler,
+                                                intptr_t num_args);
 };
 
 }  // namespace dart
 
 #endif  // VM_STUB_CODE_H_