VM: Remove unreachable code from the code generator.

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, 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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 2724 matching lines @@
 
 class PolymorphicInstanceCallInstr : public TemplateDefinition<0> {
  public:
   PolymorphicInstanceCallInstr(InstanceCallInstr* instance_call,
                                const ICData& ic_data,
                                bool with_checks)
       : instance_call_(instance_call),
         ic_data_(ic_data),
         with_checks_(with_checks) {
     ASSERT(instance_call_ != NULL);
+    ASSERT(ic_data.NumberOfChecks() > 0);
     deopt_id_ = instance_call->deopt_id();
   }
 
   InstanceCallInstr* instance_call() const { return instance_call_; }
   bool with_checks() const { return with_checks_; }
   virtual intptr_t token_pos() const { return instance_call_->token_pos(); }
 
   virtual intptr_t ArgumentCount() const {
     return instance_call()->ArgumentCount();
   }
@@ skipping 5561 matching lines @@
       Isolate* isolate, bool opt) const {                                     \
     UNIMPLEMENTED();                                                          \
     return NULL;                                                              \
   }                                                                           \
   void Name::EmitNativeCode(FlowGraphCompiler* compiler) { UNIMPLEMENTED(); }
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_