[turbofan] Introduce dedicated CallFrequency class.

src/compiler/js-inlining.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/js-inlining.h"
 
 #include "src/ast/ast.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
 #include "src/compiler/all-nodes.h"
@@ skipping 48 matching lines @@
     return NodeProperties::GetFrameStateInput(call_);
   }
 
   int formal_arguments() {
     // Both, {JSCall} and {JSConstruct}, have two extra inputs:
     //  - JSConstruct: Includes target function and new target.
     //  - JSCall: Includes target function and receiver.
     return call_->op()->ValueInputCount() - 2;
   }
 
-  float frequency() const {
+  CallFrequency frequency() const {
     return (call_->opcode() == IrOpcode::kJSCall)
                ? CallParametersOf(call_->op()).frequency()
                : ConstructParametersOf(call_->op()).frequency();
   }
 
  private:
   Node* call_;
 };
 
 Reduction JSInliner::InlineCall(Node* call, Node* new_target, Node* context,
@@ skipping 665 matching lines @@
 
 CommonOperatorBuilder* JSInliner::common() const { return jsgraph()->common(); }
 
 SimplifiedOperatorBuilder* JSInliner::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8