Remove usages of Heap::NewSpaceStart and its external reference

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1385 matching lines @@
     Isolate* isolate) {
   return ExternalReference(isolate->stack_guard()->address_of_real_jslimit());
 }
 
 
 ExternalReference ExternalReference::address_of_regexp_stack_limit(
     Isolate* isolate) {
   return ExternalReference(isolate->regexp_stack()->limit_address());
 }
 
-
-ExternalReference ExternalReference::new_space_start(Isolate* isolate) {
-  return ExternalReference(isolate->heap()->NewSpaceStart());
-}
-
-
 ExternalReference ExternalReference::store_buffer_top(Isolate* isolate) {
   return ExternalReference(isolate->heap()->store_buffer_top_address());
 }
 
 
 ExternalReference ExternalReference::new_space_allocation_top_address(
     Isolate* isolate) {
   return ExternalReference(isolate->heap()->NewSpaceAllocationTopAddress());
 }
 
@@ skipping 658 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8