Silence control reducer tracing a bit.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/687553002

Cr-Commit-Position: refs/heads/master@{#24936}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24936 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/control-reducer.cc

@@ -18,7 +18,7 @@ enum VisitState { kUnvisited = 0, kOnStack = 1, kRevisit = 2, kVisited = 3 };
 enum Reachability { kFromStart = 8 };
 
 #define TRACE(x) \
-  if (FLAG_trace_turbo) PrintF x
+  if (FLAG_trace_turbo_reduction) PrintF x
 
 class ControlReducerImpl {
  public:

src/flag-definitions.h

@@ -353,8 +353,9 @@ DEFINE_STRING(turbo_filter, "~", "optimization filter for TurboFan compiler")
 DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR")
 DEFINE_STRING(trace_turbo_cfg_file, NULL,
               "trace turbo cfg graph (for C1 visualizer) to a given file name")
-DEFINE_BOOL(trace_turbo_types, true, "trace generated TurboFan types")
-DEFINE_BOOL(trace_turbo_scheduler, false, "trace generated TurboFan scheduler")
+DEFINE_BOOL(trace_turbo_types, true, "trace TurboFan's types")
+DEFINE_BOOL(trace_turbo_scheduler, false, "trace TurboFan's scheduler")
+DEFINE_BOOL(trace_turbo_reduction, false, "trace TurboFan's various reducers")
 DEFINE_BOOL(turbo_asm, false, "enable TurboFan for asm.js code")
 DEFINE_BOOL(turbo_verify, false, "verify TurboFan graphs at each phase")
 DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics")