[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 3435d8d0d2cba50f119dc6236352a2dfe0be3a25..7e8d6db843b64a900a2f39feaf905dd2ba06a7c1 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -2184,6 +2184,11 @@ 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);