[turbofan] Add support for transitioning stores to double fields.

src/compiler/access-builder.h

Index: src/compiler/access-builder.h
diff --git a/src/compiler/access-builder.h b/src/compiler/access-builder.h
index fb0e82e4637836ed8bc53f229c2b035a7f77252e..048891b1310ff705ccca69210498ea472a7b6284 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -22,6 +22,9 @@ class AccessBuilder final : public AllStatic {
   // Provides access to HeapObject::map() field.
   static FieldAccess ForMap();
 
+  // Provides access to HeapNumber::value() field.
+  static FieldAccess ForHeapNumberValue();
+
   // Provides access to JSObject::properties() field.
   static FieldAccess ForJSObjectProperties();