[turbofan] Introduce dedicated CallFrequency class.

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 <memory>
 #include <sstream>
 
@@ skipping 747 matching lines @@
     if (data->info()->is_optimizing_from_bytecode()) {
       // Bytecode graph builder assumes deoptimziation is enabled.
       DCHECK(data->info()->is_deoptimization_enabled());
       JSTypeHintLowering::Flags flags = JSTypeHintLowering::kNoFlags;
       if (data->info()->is_bailout_on_uninitialized()) {
         flags |= JSTypeHintLowering::kBailoutOnUninitialized;
       }
       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();
     }
 
     if (!succeeded) {
       data->set_compilation_failed();
     }
   }
 };
 
@@ skipping 1243 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8