Fix several bugs in closure conversion.

runtime/vm/kernel_binary_flowgraph.h

 // Copyright (c) 2017, 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 RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_
 #define RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include <map>
@@ skipping 860 matching lines @@
   Value* stack();
   void Push(Definition* definition);
   Value* Pop();
 
   Tag PeekArgumentsFirstPositionalTag();
   const TypeArguments& PeekArgumentsInstantiatedType(const Class& klass);
   intptr_t PeekArgumentsCount();
   intptr_t PeekArgumentsTypeCount();
   void SkipArgumentsBeforeActualArguments();
 
+  LocalVariable* LookupParameterDirect(intptr_t kernel_offset,
+                                       intptr_t parameter_index);
   LocalVariable* LookupVariable(intptr_t kernel_offset);
   LocalVariable* MakeTemporary();
   Token::Kind MethodKind(const String& name);
   RawFunction* LookupMethodByMember(NameIndex target,
                                     const String& method_name);
 
   bool NeedsDebugStepCheck(const Function& function, TokenPosition position);
   bool NeedsDebugStepCheck(Value* value, TokenPosition position);
 
   void InlineBailout(const char* reason);
@@ skipping 238 matching lines @@
   const uint8_t* saved_raw_buffer_;
   const TypedData* saved_typed_data_;
   intptr_t saved_offset_;
 };
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_