Don't print variable descriptors by default when printing disassembly.

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 VM_FLAG_LIST_H_
 #define VM_FLAG_LIST_H_
 
 // Don't use USING_DBC outside of this file.
 #if defined(TARGET_ARCH_DBC)
 #define USING_DBC true
@@ skipping 120 matching lines @@
 P(precompiled_mode, bool, false,                                               \
   "Precompilation compiler mode")                                              \
 C(precompiled_runtime, true, false, bool, false,                               \
   "Precompiled runtime mode")                                                  \
 R(print_ssa_liveness, false, bool, false,                                      \
   "Print liveness for ssa variables.")                                         \
 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,                                           \
   "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.")                                                   \
 R(support_debugger, false, bool, true,                                         \
   "Support the debugger.")                                                     \
@@ skipping 40 matching lines @@
 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  // VM_FLAG_LIST_H_