[turbofan] Introduce dedicated CallFrequency class.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 585923fa69d36c63e016846be502018fea6b65be..fbe764d8253c54cf8fa84235e684dbe18b81fd18 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -765,12 +765,12 @@ struct GraphBuilderPhase {
       BytecodeGraphBuilder graph_builder(
           temp_zone, data->info()->shared_info(),
           handle(data->info()->closure()->feedback_vector()),
-          data->info()->osr_ast_id(), data->jsgraph(), 1.0f,
+          data->info()->osr_ast_id(), data->jsgraph(), CallFrequency(1.0f),
           data->source_positions(), SourcePosition::kNotInlined, flags);
       succeeded = graph_builder.CreateGraph();
     } else {
       AstGraphBuilderWithPositions graph_builder(
-          temp_zone, data->info(), data->jsgraph(), 1.0f,
+          temp_zone, data->info(), data->jsgraph(), CallFrequency(1.0f),
           data->loop_assignment(), data->source_positions());
       succeeded = graph_builder.CreateGraph();
     }