Move printing snapshot sizes behind a flag.

runtime/vm/flag_list.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_FLAG_LIST_H_
 #define RUNTIME_VM_FLAG_LIST_H_
 
 // Don't use USING_DBC outside of this file.
 #if defined(TARGET_ARCH_DBC)
 #define USING_DBC true
@@ skipping 104 matching lines @@
     "e.g: --old_gen_heap_size=1024 allows up to 1024MB old gen heap")          \
   R(pause_isolates_on_start, false, bool, false,                               \
     "Pause isolates before starting.")                                         \
   R(pause_isolates_on_exit, false, bool, false, "Pause isolates exiting.")     \
   R(pause_isolates_on_unhandled_exceptions, false, bool, false,                \
     "Pause isolates on unhandled exceptions.")                                 \
   P(polymorphic_with_deopt, bool, true,                                        \
     "Polymorphic calls with deoptimization / megamorphic call")                \
   P(precompiled_mode, bool, false, "Precompilation compiler mode")             \
   C(precompiled_runtime, true, false, bool, false, "Precompiled runtime mode") \
+  R(print_snapshot_sizes, false, bool, false,                                  \
+    "Print sizes of generated snapshots.")                                     \
   R(print_ssa_liveranges, false, bool, false,                                  \
     "Print live ranges after allocation.")                                     \
   C(print_stop_message, false, false, bool, false, "Print stop message.")      \
   D(print_variable_descriptors, bool, false,                                   \
     "Print variable descriptors in disassembly.")                              \
   R(profiler, false, bool, !USING_DBC && !USING_FUCHSIA,                       \
     "Enable the profiler.")                                                    \
   P(reorder_basic_blocks, bool, true, "Reorder basic blocks")                  \
   R(support_ast_printer, false, bool, true, "Support the AST printer.")        \
   R(support_compiler_stats, false, bool, true, "Support compiler stats.")      \
@@ skipping 22 matching lines @@
   C(use_osr, false, true, bool, true, "Use OSR")                               \
   P(verbose_gc, bool, false, "Enables verbose GC.")                            \
   P(verbose_gc_hdr, int, 40, "Print verbose GC header interval.")              \
   R(verify_after_gc, false, bool, false,                                       \
     "Enables heap verification after GC.")                                     \
   R(verify_before_gc, false, bool, false,                                      \
     "Enables heap verification before GC.")                                    \
   D(verify_on_transition, bool, false, "Verify on dart <==> VM.")
 
 #endif  // RUNTIME_VM_FLAG_LIST_H_