Prevent flushing of code that was set with %SetCode.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6093 matching lines @@
 
   // Indicates that the function cannot be optimized.
   DECL_BOOLEAN_ACCESSORS(dont_optimize)
 
   // Indicates that the function cannot be inlined.
   DECL_BOOLEAN_ACCESSORS(dont_inline)
 
   // Indicates that code for this function cannot be cached.
   DECL_BOOLEAN_ACCESSORS(dont_cache)
 
+  // Indicates that code for this function cannot be flushed.
+  DECL_BOOLEAN_ACCESSORS(dont_flush)
+
   // Indicates that this function is a generator.
   DECL_BOOLEAN_ACCESSORS(is_generator)
 
   // Indicates whether or not the code in the shared function support
   // deoptimization.
   inline bool has_deoptimization_support();
 
   // Enable deoptimization support through recompiled code.
   void EnableDeoptimizationSupport(Code* recompiled);
 
@@ skipping 209 matching lines @@
     kUsesArguments,
     kHasDuplicateParameters,
     kNative,
     kBoundFunction,
     kIsAnonymous,
     kNameShouldPrintAsAnonymous,
     kIsFunction,
     kDontOptimize,
     kDontInline,
     kDontCache,
+    kDontFlush,
     kIsGenerator,
     kCompilerHintsCount  // Pseudo entry
   };
 
   class DeoptCountBits: public BitField<int, 0, 4> {};
   class OptReenableTriesBits: public BitField<int, 4, 18> {};
   class ICAgeBits: public BitField<int, 22, 8> {};
 
  private:
 #if V8_HOST_ARCH_32_BIT
@@ skipping 3215 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_