Reland "[turbofan] Discard the shared code entry in the optimized code map."

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 7150 matching lines @@
   // In case of non-OSR the code reference is cleared from the cache entry but
   // the entry itself is left in the map in order to proceed sharing literals.
   void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason);
 
   // Trims the optimized code map after entries have been removed.
   void TrimOptimizedCodeMap(int shrink_by);
 
   static Handle<LiteralsArray> FindOrCreateLiterals(
       Handle<SharedFunctionInfo> shared, Handle<Context> native_context);
 
-  // Add or update entry in the optimized code map for context-independent code.
-  static void AddSharedCodeToOptimizedCodeMap(Handle<SharedFunctionInfo> shared,
-                                              Handle<Code> code);
-
   // Add or update entry in the optimized code map for context-dependent code.
   // If {code} is not given, then an existing entry's code won't be overwritten.
   static void AddToOptimizedCodeMap(Handle<SharedFunctionInfo> shared,
                                     Handle<Context> native_context,
                                     MaybeHandle<Code> code,
                                     Handle<LiteralsArray> literals,
                                     BailoutId osr_ast_id);
 
   // Set up the link between shared function info and the script. The shared
   // function info is added to the list on the script.
   static void SetScript(Handle<SharedFunctionInfo> shared,
                         Handle<Object> script_object);
 
   // Layout description of the optimized code map.
-  static const int kSharedCodeIndex = 0;
-  static const int kEntriesStart = 1;
+  static const int kEntriesStart = 0;
   static const int kContextOffset = 0;
   static const int kCachedCodeOffset = 1;
   static const int kLiteralsOffset = 2;
   static const int kOsrAstIdOffset = 3;
   static const int kEntryLength = 4;
   static const int kInitialLength = kEntriesStart + kEntryLength;
 
   static const int kNotFound = -1;
 
   // Helpers for assembly code that does a backwards walk of the optimized code
@@ skipping 581 matching lines @@
 #endif
   static const int kStrictModeByteOffset = BYTE_OFFSET(kStrictModeFunction);
   static const int kNativeByteOffset = BYTE_OFFSET(kNative);
   static const int kFunctionKindByteOffset = BYTE_OFFSET(kFunctionKind);
   static const int kHasDuplicateParametersByteOffset =
       BYTE_OFFSET(kHasDuplicateParameters);
 #undef BYTE_OFFSET
 
  private:
   // Returns entry from optimized code map for specified context and OSR entry.
-  // The result is either kNotFound, kSharedCodeIndex for context-independent
-  // entry or a start index of the context-dependent entry.
+  // The result is either kNotFound, or a start index of the context-dependent
+  // entry.
   int SearchOptimizedCodeMapEntry(Context* native_context,
                                   BailoutId osr_ast_id);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(SharedFunctionInfo);
 };
 
 
 // Printing support.
 struct SourceCodeOf {
   explicit SourceCodeOf(SharedFunctionInfo* v, int max = -1)
@@ skipping 3602 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_