Reland "Soft fail for invalid cache data."

src/compiler.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_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 21 matching lines @@
 
 class ScriptData {
  public:
   ScriptData(const byte* data, int length);
   ~ScriptData() {
     if (owns_data_) DeleteArray(data_);
   }
 
   const byte* data() const { return data_; }
   int length() const { return length_; }
+  bool rejected() const { return rejected_; }
+
+  void Reject() { rejected_ = true; }
 
   void AcquireDataOwnership() {
     DCHECK(!owns_data_);
     owns_data_ = true;
   }
 
   void ReleaseDataOwnership() {
     DCHECK(owns_data_);
     owns_data_ = false;
   }
 
  private:
-  bool owns_data_;
+  bool owns_data_ : 1;
+  bool rejected_ : 1;
   const byte* data_;
   int length_;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptData);
 };
 
 // CompilationInfo encapsulates some information known at compile time.  It
 // is constructed based on the resources available at compile-time.
 class CompilationInfo {
  public:
@@ skipping 682 matching lines @@
   Zone zone_;
   unsigned info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_