[turbofan] Fix --trace-trubo to generate complete JSON files.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1946523002
Cr-Commit-Position: refs/heads/master@{#35975}

src/compiler/pipeline.cc

@@ -471,12 +471,14 @@ class PipelineRunScope {
 
 PipelineStatistics* CreatePipelineStatistics(CompilationInfo* info,
                                              ZonePool* zone_pool) {
-  if (!FLAG_turbo_stats) return nullptr;
+  PipelineStatistics* pipeline_statistics = nullptr;
 
-  PipelineStatistics* pipeline_statistics =
-      new PipelineStatistics(info, zone_pool);
+  if (FLAG_turbo_stats) {
+    pipeline_statistics = new PipelineStatistics(info, zone_pool);
     pipeline_statistics->BeginPhaseKind("initializing");
+  }
 
+  if (FLAG_trace_turbo) {
     FILE* json_file = OpenVisualizerLogFile(info, nullptr, "json", "w+");
     if (json_file != nullptr) {
       OFStream json_of(json_file);
@@ -489,7 +491,8 @@ PipelineStatistics* CreatePipelineStatistics(CompilationInfo* info,
         DisallowHeapAllocation no_allocation;
         int start = info->shared_info()->start_position();
         int len = info->shared_info()->end_position() - start;
-      String::SubStringRange source(String::cast(script->source()), start, len);
+        String::SubStringRange source(String::cast(script->source()), start,
+                                      len);
         for (const auto& c : source) {
           json_of << AsEscapedUC16ForJSON(c);
         }
@@ -497,6 +500,7 @@ PipelineStatistics* CreatePipelineStatistics(CompilationInfo* info,
       json_of << "\",\n\"phases\":[";
       fclose(json_file);
     }
+  }
 
   return pipeline_statistics;
 }