Rip out most of our outdated modules implementation.

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 fdb3e076673720b9d42965774b6409b3f24638e1..f8743548ac27a85795544ec50e282db526d51366 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -1189,11 +1189,6 @@ void AstGraphBuilder::VisitImportDeclaration(ImportDeclaration* decl) {
 }
 
 
-void AstGraphBuilder::VisitExportDeclaration(ExportDeclaration* decl) {
-  UNREACHABLE();
-}
-
-
 void AstGraphBuilder::VisitBlock(Block* stmt) {
   BlockBuilder block(this);
   ControlScopeForBreakable scope(this, stmt, &block);