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

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index ba93e6c7ff4753fe4ac111d2cc5426b4f948b455..fb9f082333019e1d5909639006d63456f0c63a9e 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -844,6 +844,7 @@ Handle<Script> Factory::NewScript(Handle<String> source) {
   script->set_line_ends(heap->undefined_value());
   script->set_eval_from_shared(heap->undefined_value());
   script->set_eval_from_instructions_offset(Smi::FromInt(0));
+  script->set_shared_function_infos(Smi::FromInt(0));
   script->set_flags(Smi::FromInt(0));
 
   return script;
@@ -2198,6 +2199,7 @@ Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
   share->set_compiler_hints(0);
   share->set_opt_count_and_bailout_reason(0);
 
+  share->set_never_compiled(!share->is_compiled());
   return share;
 }