[turbofan] Remove unused function_type_ from Typer.

src/compiler/typer.h

 // 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.
 
 #ifndef V8_COMPILER_TYPER_H_
 #define V8_COMPILER_TYPER_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/operation-typer.h"
@@ skipping 13 matching lines @@
 class Typer {
  public:
   // Flags that control the mode of operation.
   enum Flag {
     kNoFlags = 0u,
     kDeoptimizationEnabled = 1u << 0,
   };
   typedef base::Flags<Flag> Flags;
 
   Typer(Isolate* isolate, Graph* graph, Flags flags = kNoFlags,
-        CompilationDependencies* dependencies = nullptr,
-        FunctionType* function_type = nullptr);
+        CompilationDependencies* dependencies = nullptr);
   ~Typer();
 
   void Run();
   // TODO(bmeurer,jarin): Remove this once we have a notion of "roots" on Graph.
   void Run(const ZoneVector<Node*>& roots);
 
  private:
   class Visitor;
   class Decorator;
 
   Graph* graph() const { return graph_; }
   Zone* zone() const { return graph()->zone(); }
   Isolate* isolate() const { return isolate_; }
   Flags flags() const { return flags_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
-  FunctionType* function_type() const { return function_type_; }
   OperationTyper* operation_typer() { return &operation_typer_; }
 
   Isolate* const isolate_;
   Graph* const graph_;
   Flags const flags_;
   CompilationDependencies* const dependencies_;
-  FunctionType* function_type_;
   Decorator* decorator_;
   TypeCache const& cache_;
   OperationTyper operation_typer_;
 
   Type* singleton_false_;
   Type* singleton_true_;
   Type* singleton_the_hole_;
   Type* signed32ish_;
   Type* unsigned32ish_;
   Type* falsish_;
   Type* truish_;
 
   DISALLOW_COPY_AND_ASSIGN(Typer);
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(Typer::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TYPER_H_