[turbofan] Reuse the operation typer's logic in the typer.

Review-Url: https://codereview.chromium.org/2084943002
Cr-Commit-Position: refs/heads/master@{#37166}

src/compiler/typer.h

@@ -7,6 +7,7 @@
 
 #include "src/base/flags.h"
 #include "src/compiler/graph.h"
+#include "src/compiler/operation-typer.h"
 #include "src/types.h"
 
 namespace v8 {
@@ -18,6 +19,7 @@ class TypeCache;
 
 namespace compiler {
 
+class OperationTyper;
 
 class Typer {
  public:
@@ -47,6 +49,7 @@ class Typer {
   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_;
@@ -55,6 +58,7 @@ class Typer {
   FunctionType* function_type_;
   Decorator* decorator_;
   TypeCache const& cache_;
+  OperationTyper operation_typer_;
 
   Type* singleton_false_;
   Type* singleton_true_;