Remove usages of Heap::NewSpaceStart and its external reference

src/external-reference-table.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/external-reference-table.h"
 
 #include "src/accessors.h"
 #include "src/assembler.h"
 #include "src/counters.h"
 #include "src/deoptimizer.h"
@@ skipping 13 matching lines @@
 }
 
 ExternalReferenceTable::ExternalReferenceTable(Isolate* isolate) {
   // Miscellaneous
   Add(ExternalReference::roots_array_start(isolate).address(),
       "Heap::roots_array_start()");
   Add(ExternalReference::address_of_stack_limit(isolate).address(),
       "StackGuard::address_of_jslimit()");
   Add(ExternalReference::address_of_real_stack_limit(isolate).address(),
       "StackGuard::address_of_real_jslimit()");
-  Add(ExternalReference::new_space_start(isolate).address(),
-      "Heap::NewSpaceStart()");
   Add(ExternalReference::new_space_allocation_limit_address(isolate).address(),
       "Heap::NewSpaceAllocationLimitAddress()");
   Add(ExternalReference::new_space_allocation_top_address(isolate).address(),
       "Heap::NewSpaceAllocationTopAddress()");
   Add(ExternalReference::mod_two_doubles_operation(isolate).address(),
       "mod_two_doubles");
   // Keyed lookup cache.
   Add(ExternalReference::keyed_lookup_cache_keys(isolate).address(),
       "KeyedLookupCache::keys()");
   Add(ExternalReference::keyed_lookup_cache_field_offsets(isolate).address(),
@@ skipping 301 matching lines @@
   for (int entry = 0; entry < kDeoptTableSerializeEntryCount; ++entry) {
     Address address = Deoptimizer::GetDeoptimizationEntry(
         isolate, entry, Deoptimizer::LAZY,
         Deoptimizer::CALCULATE_ENTRY_ADDRESS);
     Add(address, "lazy_deopt");
   }
 }
 
 }  // namespace internal
 }  // namespace v8