[wasm] Implement correct 2-level namespace for imports.

test/mjsunit/wasm/export-table.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 (function testExportedMain() {
@@ skipping 123 matching lines @@
   assertEquals(String(f.index), e.a.name);
 })();
 
 
 (function testReexportJSMultipleIdentity() {
   print("TestReexportMultipleIdentity...");
   var builder = new WasmModuleBuilder();
 
   function js() {}
 
-  var a = builder.addImport("a", kSig_v_v);
+  var a = builder.addImport("m", "a", kSig_v_v);
   builder.addExport("f", a);
   builder.addExport("g", a);
 
-  let instance = builder.instantiate({a: js});
+  let instance = builder.instantiate({m: {a: js}});
   let e = instance.exports;
   assertEquals("function", typeof e.f);
   assertEquals("function", typeof e.g);
   assertFalse(e.f == js);
   assertFalse(e.g == js);
   assertTrue(e.f == e.g);
 })();
 
 
 (function testReexportJSMultiple() {
   print("TestReexportMultiple...");
   var builder = new WasmModuleBuilder();
 
   function js() {}
 
-  var a = builder.addImport("a", kSig_v_v);
-  var b = builder.addImport("b", kSig_v_v);
+  var a = builder.addImport("q", "a", kSig_v_v);
+  var b = builder.addImport("q", "b", kSig_v_v);
   builder.addExport("f", a);
   builder.addExport("g", b);
 
-  let instance = builder.instantiate({a: js, b: js});
+  let instance = builder.instantiate({q: {a: js, b: js}});
   let e = instance.exports;
   assertEquals("function", typeof e.f);
   assertEquals("function", typeof e.g);
   assertFalse(e.f == js);
   assertFalse(e.g == js);
   assertFalse(e.f == e.g);
 })();