Improve code for checked instance calls (polymorphic calls) and expand printing of PolymorphicInsta…

runtime/vm/flow_graph_compiler_ia32.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_IA32_H_
 #define VM_FLOW_GRAPH_COMPILER_IA32_H_
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #error Include flow_graph_compiler.h instead of flow_graph_compiler_ia32.h.
 #endif
@@ skipping 121 matching lines @@
                             const ICData& ic_data,
                             const Array& arguments_descriptor,
                             intptr_t argument_count);
 
   void EmitLoadIndexedGeneric(LoadIndexedComp* comp);
   void EmitTestAndCall(const ICData& ic_data,
                        Register class_id_reg,
                        intptr_t arg_count,
                        const Array& arg_names,
                        Label* deopt,
-                       Label* done,
+                       Label* done,  // Can be NULL, which means fallthrough.
                        intptr_t cid,
                        intptr_t token_index,
                        intptr_t try_index);
 
   intptr_t StackSize() const;
 
   // Returns assembler label associated with the given block entry.
   Label* GetBlockLabel(BlockEntryInstr* block_entry) const;
 
   // Returns true if the next block after current in the current block order
@@ skipping 167 matching lines @@
   const DeoptReasonId reason_;
   GrowableArray<Register> registers_;
   Label entry_label_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptimizationStub);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_IA32_H_