[async-functions] support await expressions in finally statements

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index b1495d362874ae2a0330a17f5cdb46966620cbd0..368fe429b4ae5dd31bf1eb6d25e303d9846e2233 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -2181,6 +2181,11 @@ void AstGraphBuilder::VisitGetIterator(GetIterator* expr) {
   UNREACHABLE();
 }
 
+void AstGraphBuilder::VisitInternalVariable(InternalVariable* expr) {
+  // InternalVariable is supported only by going through Ignition first.
+  UNREACHABLE();
+}
+
 void AstGraphBuilder::VisitThisFunction(ThisFunction* expr) {
   Node* value = GetFunctionClosure();
   ast_context()->ProduceValue(expr, value);