Rip out most of our outdated modules implementation.

src/wasm/asm-wasm-builder.cc

Index: src/wasm/asm-wasm-builder.cc
diff --git a/src/wasm/asm-wasm-builder.cc b/src/wasm/asm-wasm-builder.cc
index 958fd0c389a2d9f0665f331fbd47a101c285fe9f..8764a81dc4206750d21da7f5bdbfcb6dfa4f7aa9 100644
--- a/src/wasm/asm-wasm-builder.cc
+++ b/src/wasm/asm-wasm-builder.cc
@@ -137,8 +137,6 @@ class AsmWasmBuilderImpl : public AstVisitor {
 
   void VisitImportDeclaration(ImportDeclaration* decl) override {}
 
-  void VisitExportDeclaration(ExportDeclaration* decl) override {}
-
   void VisitStatements(ZoneList<Statement*>* stmts) override {
     for (int i = 0; i < stmts->length(); ++i) {
       Statement* stmt = stmts->at(i);