[turbofan] Small fixes to PipelineStatistics. Collect statistics in tests.

src/compiler/pipeline.cc

 // Copyright 2014 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/compiler/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/base/adapters.h"
@@ skipping 1121 matching lines @@
 }
 
 
 Handle<Code> Pipeline::GenerateCodeForTesting(CompilationInfo* info,
                                               CallDescriptor* call_descriptor,
                                               Graph* graph,
                                               Schedule* schedule) {
   // Construct a pipeline for scheduling and code generation.
   ZonePool zone_pool;
   PipelineData data(&zone_pool, info, graph, schedule);
+  SmartPointer<PipelineStatistics> pipeline_statistics;
+  if (FLAG_turbo_stats) {
+    pipeline_statistics.Reset(new PipelineStatistics(info, &zone_pool));
+    pipeline_statistics->BeginPhaseKind("test codegen");
+  }
+
   Pipeline pipeline(info);
   pipeline.data_ = &data;
   if (data.schedule() == nullptr) {
     // TODO(rossberg): Should this really be untyped?
     pipeline.RunPrintAndVerify("Machine", true);
   }
 
   return pipeline.ScheduleAndGenerateCode(call_descriptor);
 }
 
@@ skipping 186 matching lines @@
     tcf << AsC1VRegisterAllocationData("CodeGen",
                                        data->register_allocation_data());
   }
 
   data->DeleteRegisterAllocationZone();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8