Revert of [debugger] flood function for stepping before calling it.

src/snapshot/serialize.cc

Index: src/snapshot/serialize.cc
diff --git a/src/snapshot/serialize.cc b/src/snapshot/serialize.cc
index f4563984f9dde008decbcba023b252b70fd49132..4ccadd256d8cf961da126706717813b92a77f126 100644
--- a/src/snapshot/serialize.cc
+++ b/src/snapshot/serialize.cc
@@ -60,8 +60,8 @@
       "Heap::NewSpaceAllocationLimitAddress()");
   Add(ExternalReference::new_space_allocation_top_address(isolate).address(),
       "Heap::NewSpaceAllocationTopAddress()");
-  Add(ExternalReference::debug_last_step_action_address(isolate).address(),
-      "Debug::last_step_action_addr()");
+  Add(ExternalReference::debug_step_in_fp_address(isolate).address(),
+      "Debug::step_in_fp_addr()");
   Add(ExternalReference::mod_two_doubles_operation(isolate).address(),
       "mod_two_doubles");
   // Keyed lookup cache.