[turbofan] Fix --trace-turbo-load-elimination.

The LoadElimination must be able to print Maps, so we need to allow
handle dereferencing here.

Change-Id: Id39a6db5a4f40ec6212404b3aa30a36fdd1ba57e
Reviewed-on: https://chromium-review.googlesource.com/1188127
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55374}

src/compiler/load-elimination.cc

@@ -445,6 +445,7 @@ LoadElimination::AbstractMaps const* LoadElimination::AbstractMaps::Extend(
 }
 
 void LoadElimination::AbstractMaps::Print() const {
+  AllowHandleDereference allow_handle_dereference;
   StdoutStream os;
   for (auto pair : info_for_node_) {
     os << "    #" << pair.first->id() << ":" << pair.first->op()->mnemonic()