Print reason for disabling optimization. Kill --trace-bailout flag.

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 307 matching lines @@
 DEFINE_bool(opt, true, "use adaptive optimizations")
 DEFINE_bool(always_opt, false, "always try to optimize functions")
 DEFINE_bool(prepare_always_opt, false, "prepare for turning on always opt")
 DEFINE_bool(trace_deopt, false, "trace deoptimization")
 
 // compiler.cc
 DEFINE_int(min_preparse_length, 1024,
            "minimum length for automatic enable preparsing")
 DEFINE_bool(always_full_compiler, false,
             "try to use the dedicated run-once backend for all code")
-DEFINE_bool(trace_bailout, false,
-            "print reasons for falling back to using the classic V8 backend")
 DEFINE_int(max_opt_count, 10,
            "maximum number of optimization attempts before giving up.")
 
 // compilation-cache.cc
 DEFINE_bool(compilation_cache, true, "enable compilation cache")
 
 DEFINE_bool(cache_prototype_transitions, true, "cache prototype transitions")
 
 // debug.cc
 DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response")
@@ skipping 350 matching lines @@
 #undef DEFINE_bool
 #undef DEFINE_int
 #undef DEFINE_string
 #undef DEFINE_implication
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS