Do not look for existing shared function info when compiling a new script.

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 109 matching lines @@
     kDebug = 1 << 6,
     kCompilingForDebugging = 1 << 7,
     kSerializing = 1 << 8,
     kContextSpecializing = 1 << 9,
     kInliningEnabled = 1 << 10,
     kTypingEnabled = 1 << 11,
     kDisableFutureOptimization = 1 << 12,
     kSplittingEnabled = 1 << 13,
     kTypeFeedbackEnabled = 1 << 14,
     kDeoptimizationEnabled = 1 << 15,
-    kSourcePositionsEnabled = 1 << 16
+    kSourcePositionsEnabled = 1 << 16,
+    kNewScript = 1 << 17,
   };
 
   explicit CompilationInfo(ParseInfo* parse_info);
   CompilationInfo(CodeStub* stub, Isolate* isolate, Zone* zone);
   virtual ~CompilationInfo();
 
   ParseInfo* parse_info() const { return parse_info_; }
 
   // -----------------------------------------------------------
   // TODO(titzer): inline and delete accessors of ParseInfo
@@ skipping 97 matching lines @@
   bool is_inlining_enabled() const { return GetFlag(kInliningEnabled); }
 
   void MarkAsTypingEnabled() { SetFlag(kTypingEnabled); }
 
   bool is_typing_enabled() const { return GetFlag(kTypingEnabled); }
 
   void MarkAsSplittingEnabled() { SetFlag(kSplittingEnabled); }
 
   bool is_splitting_enabled() const { return GetFlag(kSplittingEnabled); }
 
+  void MarkAsNewScript() { SetFlag(kNewScript); }
+
+  bool is_new_script() const { return GetFlag(kNewScript); }
+
   bool IsCodePreAgingActive() const {
     return FLAG_optimize_for_size && FLAG_age_code && !will_serialize() &&
            !is_debug();
   }
 
   void EnsureFeedbackVector();
   Handle<TypeFeedbackVector> feedback_vector() const {
     return feedback_vector_;
   }
   void SetCode(Handle<Code> code) { code_ = code; }
@@ skipping 423 matching lines @@
   Zone zone_;
   size_t info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_