[compiler] Improve contract for Compiler::CompileDebugCode.

src/debug/liveedit.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DEBUG_LIVEEDIT_H_
 #define V8_DEBUG_LIVEEDIT_H_
 
 
 // Live Edit feature implementation.
 // User should be able to change script on already running VM. This feature
@@ skipping 274 matching lines @@
 class FunctionInfoWrapper : public JSArrayBasedStruct<FunctionInfoWrapper> {
  public:
   explicit FunctionInfoWrapper(Handle<JSArray> array)
       : JSArrayBasedStruct<FunctionInfoWrapper>(array) {
   }
 
   void SetInitialProperties(Handle<String> name, int start_position,
                             int end_position, int param_num, int literal_count,
                             int parent_index);
 
-  void SetFunctionCode(Handle<Code> function_code,
+  void SetFunctionCode(Handle<AbstractCode> function_code,
                        Handle<HeapObject> code_scope_info);
 
   void SetFunctionScopeInfo(Handle<Object> scope_info_array) {
     this->SetField(kFunctionScopeInfoOffset_, scope_info_array);
   }
 
   void SetSharedFunctionInfo(Handle<SharedFunctionInfo> info);
 
   int GetLiteralCount() {
     return this->GetSmiValueField(kLiteralNumOffset_);
   }
 
   int GetParentIndex() {
     return this->GetSmiValueField(kParentIndexOffset_);
   }
 
-  Handle<Code> GetFunctionCode();
+  Handle<AbstractCode> GetFunctionCode();
 
   MaybeHandle<TypeFeedbackMetadata> GetFeedbackMetadata();
 
   Handle<Object> GetCodeScopeInfo();
 
   int GetStartPosition() {
     return this->GetSmiValueField(kStartPositionOffset_);
   }
 
   int GetEndPosition() { return this->GetSmiValueField(kEndPositionOffset_); }
@@ skipping 47 matching lines @@
   static const int kSharedInfoOffset_ = 3;
   static const int kSize_ = 4;
 
   friend class JSArrayBasedStruct<SharedInfoWrapper>;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif /* V8_DEBUG_LIVEEDIT_H_ */