[compiler] Move tracing from backends to compiler.

src/crankshaft/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 114 matching lines @@
     return AbortOptimization(kTooManyParameters);
   }
 
   if (info()->is_osr() &&
       LUnallocated::TooManyParametersOrStackSlots(scope->num_parameters(),
                                                   scope->num_stack_slots())) {
     // Crankshaft would require too many Lithium operands.
     return AbortOptimization(kTooManyParametersLocals);
   }
 
-  if (FLAG_trace_opt) {
-    OFStream os(stdout);
-    os << "[compiling method " << Brief(*info()->closure())
-       << " using Crankshaft";
-    if (info()->is_osr()) os << " OSR";
-    os << "]" << std::endl;
-  }
-
   if (FLAG_trace_hydrogen) {
     isolate()->GetHTracer()->TraceCompilation(info());
   }
 
   // Type-check the function.
   AstTyper(info()->isolate(), info()->zone(), info()->closure(),
            info()->scope(), info()->osr_ast_id(), info()->literal())
       .Run();
 
   // Optimization could have been disabled by the parser. Note that this check
@@ skipping 13550 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8