VM: Fix slow-path deoptimization environment.

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 7949 matching lines @@
       index -= env->Length();
       env = env->outer_;
     }
     return env->ValueAt(index);
   }
 
   intptr_t fixed_parameter_count() const {
     return fixed_parameter_count_;
   }
 
+  intptr_t CountArgsPushed() {
+    intptr_t count = 0;
+    for (Environment::DeepIterator it(this); !it.Done(); it.Advance()) {
+      if (it.CurrentValue()->definition()->IsPushArgument()) {
+        count++;
+      }
+    }
+    return count;
+  }
+
   const Code& code() const { return parsed_function_.code(); }
 
   Environment* DeepCopy(Isolate* isolate) const {
     return DeepCopy(isolate, Length());
   }
 
   void DeepCopyTo(Isolate* isolate, Instruction* instr) const;
   void DeepCopyToOuter(Isolate* isolate, Instruction* instr) const;
 
   void DeepCopyAfterTo(Isolate* isolate,
@@ skipping 76 matching lines @@
   LocationSummary* Name::MakeLocationSummary(Zone* zone, bool opt) const {    \
     UNIMPLEMENTED();                                                          \
     return NULL;                                                              \
   }                                                                           \
   void Name::EmitNativeCode(FlowGraphCompiler* compiler) { UNIMPLEMENTED(); }
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_