[turbofan] Lower HeapNumber allocations to Allocate nodes.

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 b5e01cf966b4af80fab9d67e7c0b55f5b0f7f91d..1c5b1824fea5e26b999462172136465a9274ea56 100644
--- a/src/compiler/js-graph.cc
+++ b/src/compiler/js-graph.cc
@@ -29,6 +29,11 @@ Node* JSGraph::EmptyFixedArrayConstant() {
                 HeapConstant(factory()->empty_fixed_array()));
 }
 
+Node* JSGraph::HeapNumberMapConstant() {
+  return CACHED(kHeapNumberMapConstant,
+                HeapConstant(factory()->heap_number_map()));
+}
+
 Node* JSGraph::OptimizedOutConstant() {
   return CACHED(kOptimizedOutConstant,
                 HeapConstant(factory()->optimized_out()));