Split some SharedFunctionInfo's compiler hints off into debugger hints.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index fac61a6ee8a212b677d04e78f2f52a76c59e821c..4aa62063209940111756241a8f644090c315177d 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -2405,7 +2405,7 @@ Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
   share->SetConstructStub(*construct_stub);
   share->set_instance_class_name(*Object_string());
   share->set_script(*undefined_value(), SKIP_WRITE_BARRIER);
-  share->set_debug_info(DebugInfo::uninitialized(), SKIP_WRITE_BARRIER);
+  share->set_debug_info(Smi::kZero, SKIP_WRITE_BARRIER);
   share->set_function_identifier(*undefined_value(), SKIP_WRITE_BARRIER);
   StaticFeedbackVectorSpec empty_spec;
   Handle<TypeFeedbackMetadata> feedback_metadata =
@@ -2509,6 +2509,7 @@ Handle<String> Factory::NumberToString(Handle<Object> number,
 
 
 Handle<DebugInfo> Factory::NewDebugInfo(Handle<SharedFunctionInfo> shared) {
+  DCHECK(!shared->HasDebugInfo());
   // Allocate initial fixed array for active break points before allocating the
   // debug info object to avoid allocation while setting up the debug info
   // object.
@@ -2528,6 +2529,7 @@ Handle<DebugInfo> Factory::NewDebugInfo(Handle<SharedFunctionInfo> shared) {
   Handle<DebugInfo> debug_info =
       Handle<DebugInfo>::cast(NewStruct(DEBUG_INFO_TYPE));
   debug_info->set_shared(*shared);
+  debug_info->set_debugger_hints(shared->debugger_hints());
   debug_info->set_debug_bytecode_array(*maybe_debug_bytecode_array);
   debug_info->set_break_points(*break_points);