[wasm] Add support for exporting WebAssembly.Table instances.

test/mjsunit/wasm/export-table.js

Index: test/mjsunit/wasm/export-table.js
diff --git a/test/mjsunit/wasm/export-table.js b/test/mjsunit/wasm/export-table.js
index 89e0b4436dd5e8764b80de79bff599395a8c6bb9..4e9f1314e30457baf50bfc26232be116e83dbcfd 100644
--- a/test/mjsunit/wasm/export-table.js
+++ b/test/mjsunit/wasm/export-table.js
@@ -8,6 +8,7 @@ load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 (function testExportedMain() {
+  print("TestExportedMain...");
   var kReturnValue = 88;
   var builder = new WasmModuleBuilder();
 
@@ -28,6 +29,7 @@ load("test/mjsunit/wasm/wasm-module-builder.js");
 })();
 
 (function testExportedTwice() {
+  print("TestExportedTwice...");
   var kReturnValue = 99;
 
   var builder = new WasmModuleBuilder();
@@ -49,10 +51,12 @@ load("test/mjsunit/wasm/wasm-module-builder.js");
 
   assertEquals(kReturnValue, module.exports.foo());
   assertEquals(kReturnValue, module.exports.blah());
+  assertSame(module.exports.blah, module.exports.foo);
 })();
 
 
 (function testNumericName() {
+  print("TestNumericName...");
   var kReturnValue = 93;
 
   var builder = new WasmModuleBuilder();
@@ -74,6 +78,7 @@ load("test/mjsunit/wasm/wasm-module-builder.js");
 })();
 
 (function testExportNameClash() {
+  print("TestExportNameClash...");
   var builder = new WasmModuleBuilder();
 
   builder.addFunction("one",   kSig_v_v).addBody([kExprNop]).exportAs("main");
@@ -87,3 +92,23 @@ load("test/mjsunit/wasm/wasm-module-builder.js");
     assertContains("Duplicate export", e.toString());
   }
 })();
+
+
+(function testExportMultipleIdentity() {
+  print("TestExportMultipleIdentity...");
+  var builder = new WasmModuleBuilder();
+
+  builder.addFunction("one", kSig_v_v).addBody([kExprNop])
+    .exportAs("a")
+    .exportAs("b")
+    .exportAs("c");
+
+  let instance = builder.instantiate();
+  let e = instance.exports;
+  assertEquals("function", typeof e.a);
+  assertEquals("function", typeof e.b);
+  assertEquals("function", typeof e.c);
+  assertSame(e.a, e.b);
+  assertSame(e.a, e.c);
+  assertEquals("a", e.a.name);
+})();