Revert of 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 00d01001240acac63c91356ffe00fdda5a96fe3f..bd0c516e753a191f31d145c28ace81ec00439284 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -238,6 +238,25 @@
   if (expr == nullptr || !expr->IsFunctionLiteral()) return false;
   DCHECK_NOT_NULL(expr->AsFunctionLiteral()->scope());
   return expr->AsFunctionLiteral()->scope()->NeedsHomeObject();
+}
+
+
+// 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;
+      }
+    }
+  }
 }