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

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index c2995773e3fe31d250f1e8ab76e82b848885a28d..2002837e43919b790416bb7d6c94b18bd75a05fb 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -1249,7 +1249,7 @@ CompilationPhase::~CompilationPhase() {
 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);
 }