WIP: type profiling.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 5fb20da9a5df17e8f6edf4cb87e1666dfa8aaa75..17b36528cbeb66a1d4ec589bb9f67dfb06750f30 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1256,6 +1256,11 @@ Type* Typer::Visitor::TypeJSStoreDataPropertyInLiteral(Node* node) {
   return nullptr;
 }
 
+Type* Typer::Visitor::TypeJSCollectTypeProfile(Node* node) {
+  UNREACHABLE();
+  return nullptr;
+}
+
 Type* Typer::Visitor::TypeJSDeleteProperty(Node* node) {
   return Type::Boolean();
 }