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

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index bd0c516e753a191f31d145c28ace81ec00439284..00d01001240acac63c91356ffe00fdda5a96fe3f 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -241,25 +241,6 @@ bool FunctionLiteral::NeedsHomeObject(Expression* expr) {
 }
 
 
-// Helper to find an existing shared function info in the baseline code for the
-// given function literal. Used to canonicalize SharedFunctionInfo objects.
-void FunctionLiteral::InitializeSharedInfo(
-    Handle<Code> unoptimized_code) {
-  for (RelocIterator it(*unoptimized_code); !it.done(); it.next()) {
-    RelocInfo* rinfo = it.rinfo();
-    if (rinfo->rmode() != RelocInfo::EMBEDDED_OBJECT) continue;
-    Object* obj = rinfo->target_object();
-    if (obj->IsSharedFunctionInfo()) {
-      SharedFunctionInfo* shared = SharedFunctionInfo::cast(obj);
-      if (shared->start_position() == start_position()) {
-        shared_info_ = Handle<SharedFunctionInfo>(shared);
-        break;
-      }
-    }
-  }
-}
-
-
 ObjectLiteralProperty::ObjectLiteralProperty(Expression* key, Expression* value,
                                              Kind kind, bool is_static,
                                              bool is_computed_name)