Use big-boy Types to annotate interface descriptor parameters

src/compiler/typer.h

Index: src/compiler/typer.h
diff --git a/src/compiler/typer.h b/src/compiler/typer.h
index 66c493357e27a5122237bb44dcf218190caa652a..1a0f4500d129192884b34c1bc99762f213612dfc 100644
--- a/src/compiler/typer.h
+++ b/src/compiler/typer.h
@@ -18,7 +18,8 @@ class LazyTypeCache;
 
 class Typer {
  public:
-  Typer(Isolate* isolate, Graph* graph, MaybeHandle<Context> context);
+  Typer(Isolate* isolate, Graph* graph, Type::FunctionType* function_type,
+        MaybeHandle<Context> context);
   ~Typer();
 
   void Run();
@@ -29,6 +30,7 @@ class Typer {
   MaybeHandle<Context> context() { return context_; }
   Zone* zone() { return graph_->zone(); }
   Isolate* isolate() { return isolate_; }
+  Type::FunctionType* function_type() const { return function_type_; }
 
  private:
   class Visitor;
@@ -36,6 +38,7 @@ class Typer {
 
   Isolate* isolate_;
   Graph* graph_;
+  Type::FunctionType* function_type_;
   MaybeHandle<Context> context_;
   Decorator* decorator_;