Allow uint32 value on optimized frames if they are consumed by safe operations.

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 200 matching lines @@
             "info, not JSFunction itself")
 DEFINE_bool(cache_optimized_code, true,
             "cache optimized code for closures")
 DEFINE_bool(inline_construct, true, "inline constructor calls")
 DEFINE_bool(inline_arguments, true, "inline functions with arguments object")
 DEFINE_bool(inline_accessors, false, "inline JavaScript accessors")
 DEFINE_int(loop_weight, 1, "loop weight for representation inference")
 
 DEFINE_bool(optimize_for_in, true,
             "optimize functions containing for-in loops")
+DEFINE_bool(opt_safe_uint32_operations, true,
+            "allow uint32 values on optimize frames if they are used only in"
+            "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")
 
 // Experimental profiler changes.
 DEFINE_bool(experimental_profiler, true, "enable all profiler experiments")
 DEFINE_bool(watch_ic_patching, false, "profiler considers IC stability")
@@ skipping 457 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