Remove prototype checks for leaf maps in optimized code.

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 227 matching lines @@
             "safe operations")
 
 DEFINE_bool(parallel_recompilation, false,
             "optimizing hot functions asynchronously on a separate thread")
 DEFINE_bool(trace_parallel_recompilation, false, "track parallel recompilation")
 DEFINE_int(parallel_recompilation_queue_length, 2,
            "the length of the parallel compilation queue")
 DEFINE_bool(manual_parallel_recompilation, false,
             "disable automatic optimization")
 DEFINE_implication(manual_parallel_recompilation, parallel_recompilation)
+DEFINE_bool(omit_prototype_checks_for_leaf_maps, true,
+            "do not emit prototype checks if all prototypes have leaf maps, "
+            "deoptimize the optimized code if the layout of the maps changes.")
 
 // Experimental profiler changes.
 DEFINE_bool(experimental_profiler, true, "enable all profiler experiments")
 DEFINE_bool(watch_ic_patching, false, "profiler considers IC stability")
 DEFINE_int(frame_count, 1, "number of stack frames inspected by the profiler")
 DEFINE_bool(self_optimization, false,
             "primitive functions trigger their own optimization")
 DEFINE_bool(direct_self_opt, false,
             "call recompile stub directly when self-optimizing")
 DEFINE_bool(retry_self_opt, false, "re-try self-optimization if it failed")
@@ skipping 483 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