Move most of the implementation of AdjustAmountOfExternalMemory to v8.h

src/flag-definitions.h

 // Copyright 2012 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.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 476 matching lines @@
             "do not print trace line after scavenger collection")
 DEFINE_bool(print_cumulative_gc_stat, false,
             "print cumulative GC statistics in name=value format on exit")
 DEFINE_bool(print_max_heap_committed, false,
             "print statistics of the maximum memory committed for the heap "
             "in name=value format on exit")
 DEFINE_bool(trace_gc_verbose, false,
             "print more details following each garbage collection")
 DEFINE_bool(trace_fragmentation, false,
             "report fragmentation for old pointer and data pages")
-DEFINE_bool(trace_external_memory, false,
-            "print amount of external allocated memory after each time "
-            "it is adjusted.")
 DEFINE_bool(collect_maps, true,
             "garbage collect maps from which no objects can be reached")
 DEFINE_bool(weak_embedded_maps_in_ic, true,
             "make maps embedded in inline cache stubs")
 DEFINE_bool(weak_embedded_maps_in_optimized_code, true,
             "make maps embedded in optimized code weak")
 DEFINE_bool(weak_embedded_objects_in_optimized_code, true,
             "make objects embedded in optimized code weak")
 DEFINE_bool(flush_code, true,
             "flush code that we expect not to use again (during full gc)")
@@ skipping 382 matching lines @@
 #undef DEFINE_ALIAS_float
 #undef DEFINE_ALIAS_args
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA