Add --trace-hydrogen-stubs flag (default = false).

src/compiler.cc

 // 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.
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@@ skipping 1231 matching lines @@
     size += info_->zone()->allocation_size() - info_zone_start_allocation_size_;
     int64_t ticks = OS::Ticks() - start_ticks_;
     isolate()->GetHStatistics()->SaveTiming(name_, ticks, size);
   }
 }
 
 
 bool CompilationPhase::ShouldProduceTraceOutput() const {
   // Produce trace output if flag is set so that the first letter of the
   // phase name matches the command line parameter FLAG_trace_phase.
-  return (FLAG_trace_hydrogen &&
+  return ((FLAG_trace_hydrogen || FLAG_trace_hydrogen_stubs) &&

[Michael Starzinger, 2013/07/24 12:03:54]

IIUC, this will still create output for both, stubs and optimized functions, for
all phases. Only the very first tracing output will be skipped.

           OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 } }  // namespace v8::internal