[turbofan] Run everything after representation selection concurrently.

src/compiler/js-graph.cc

Index: src/compiler/js-graph.cc
diff --git a/src/compiler/js-graph.cc b/src/compiler/js-graph.cc
index 1c5b1824fea5e26b999462172136465a9274ea56..2b15fe3333aa53b95272531ff6c938d0562530b2 100644
--- a/src/compiler/js-graph.cc
+++ b/src/compiler/js-graph.cc
@@ -81,9 +81,6 @@ Node* JSGraph::NaNConstant() {
 
 
 Node* JSGraph::HeapConstant(Handle<HeapObject> value) {
-  if (value->IsConsString()) {
-    value = String::Flatten(Handle<String>::cast(value), TENURED);
-  }
   Node** loc = cache_.FindHeapConstant(value);
   if (*loc == nullptr) {
     *loc = graph()->NewNode(common()->HeapConstant(value));