Cache optimized code on shared function info.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 874dcbc902ea0111d5f49b756f774df7c4b35af4..f9cdce715e56a583731279e6930a1be9dbb7ba8b 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4051,6 +4051,12 @@ class SharedFunctionInfo: public HeapObject {
   // [code]: Function code.
   DECL_ACCESSORS(code, Code)
 
+  // [optimized_code_map]: Map from global context to optimized code
+  // or Smi 0 if none.
+  DECL_ACCESSORS(optimized_code_map, Object)
+
+  Code* SearchOptimizedCodeMap(Context* global_context);
+
   // [scope_info]: Scope info.
   DECL_ACCESSORS(scope_info, SerializedScopeInfo)
 
@@ -4158,6 +4164,9 @@ class SharedFunctionInfo: public HeapObject {
   // IsInobjectSlackTrackingInProgress is false after this call.
   void CompleteInobjectSlackTracking();
 
+  // Invoked before pointers in SharedFunctionInfo are being marked.
+  inline void BeforeVisitingPointers();
+
   // Clears the initial_map before the GC marking phase to ensure the reference
   // is weak. IsInobjectSlackTrackingInProgress is false after this call.
   void DetachInitialMap();
@@ -4353,7 +4362,8 @@ class SharedFunctionInfo: public HeapObject {
   // Pointer fields.
   static const int kNameOffset = HeapObject::kHeaderSize;
   static const int kCodeOffset = kNameOffset + kPointerSize;
-  static const int kScopeInfoOffset = kCodeOffset + kPointerSize;
+  static const int kOptimizedCodeMapOffset = kCodeOffset + kPointerSize;
+  static const int kScopeInfoOffset = kOptimizedCodeMapOffset + kPointerSize;
   static const int kConstructStubOffset = kScopeInfoOffset + kPointerSize;
   static const int kInstanceClassNameOffset =
       kConstructStubOffset + kPointerSize;