Reland "Keep a canonical list of shared function infos."

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 6a3c5b2b08a65ea23afce0d7ea0ccffa68fec192..f87a3399401cd067dba1ca72e1537bc0d753138b 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -128,7 +128,8 @@ class CompilationInfo {
     kSplittingEnabled = 1 << 13,
     kTypeFeedbackEnabled = 1 << 14,
     kDeoptimizationEnabled = 1 << 15,
-    kSourcePositionsEnabled = 1 << 16
+    kSourcePositionsEnabled = 1 << 16,
+    kFirstCompile = 1 << 17,
   };
 
   explicit CompilationInfo(ParseInfo* parse_info);
@@ -246,6 +247,10 @@ class CompilationInfo {
 
   bool is_splitting_enabled() const { return GetFlag(kSplittingEnabled); }
 
+  void MarkAsFirstCompile() { SetFlag(kFirstCompile); }
+
+  bool is_first_compile() const { return GetFlag(kFirstCompile); }
+
   bool IsCodePreAgingActive() const {
     return FLAG_optimize_for_size && FLAG_age_code && !will_serialize() &&
            !is_debug();
@@ -646,9 +651,8 @@ class Compiler : public AllStatic {
                                                           int source_length);
 
   // Create a shared function info object (the code may be lazily compiled).
-  static Handle<SharedFunctionInfo> BuildFunctionInfo(FunctionLiteral* node,
-                                                      Handle<Script> script,
-                                                      CompilationInfo* outer);
+  static Handle<SharedFunctionInfo> GetSharedFunctionInfo(
+      FunctionLiteral* node, Handle<Script> script, CompilationInfo* outer);
 
   enum ConcurrencyMode { NOT_CONCURRENT, CONCURRENT };