[turbofan] Add initial support for growing stores.

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 d8a8af412a9cbcad453d91a21c0648473809d557..f6afc77dddb5ab7dbc639de5604006f590785101 100644
--- a/src/compiler/js-graph.cc
+++ b/src/compiler/js-graph.cc
@@ -57,6 +57,11 @@ Node* JSGraph::FixedArrayMapConstant() {
                 HeapConstant(factory()->fixed_array_map()));
 }
 
+Node* JSGraph::FixedDoubleArrayMapConstant() {
+  return CACHED(kFixedDoubleArrayMapConstant,
+                HeapConstant(factory()->fixed_double_array_map()));
+}
+
 Node* JSGraph::HeapNumberMapConstant() {
   return CACHED(kHeapNumberMapConstant,
                 HeapConstant(factory()->heap_number_map()));