Roll back all step-in-fix-related changes

src/serialize.cc

Index: src/serialize.cc
diff --git a/src/serialize.cc b/src/serialize.cc
index 3988b4a893e77ba5bff1bb0331a0c9ecf5f8dcfb..0e283f4618bba028ce22b33ae8949b352d63c411 100644
--- a/src/serialize.cc
+++ b/src/serialize.cc
@@ -237,10 +237,6 @@ void ExternalReferenceTable::PopulateTable() {
       DEBUG_ADDRESS,
       Debug::k_debug_break_return_address << kDebugIdShift,
       "Debug::debug_break_return_address()");
-  Add(Debug_Address(Debug::k_restarter_frame_function_pointer).address(),
-      DEBUG_ADDRESS,
-      Debug::k_restarter_frame_function_pointer << kDebugIdShift,
-      "Debug::restarter_frame_function_pointer_address()");
   const char* debug_register_format = "Debug::register_address(%i)";
   int dr_format_length = StrLength(debug_register_format);
   for (int i = 0; i < kNumJSCallerSaved; ++i) {
@@ -482,7 +478,6 @@ ExternalReferenceEncoder::ExternalReferenceEncoder()
 
 uint32_t ExternalReferenceEncoder::Encode(Address key) const {
   int index = IndexOf(key);
-  ASSERT(key == NULL || index >= 0);
   return index >=0 ? ExternalReferenceTable::instance()->code(index) : 0;
 }