[wasm] Reduce usage of old Wasm.* API in JS tests.

test/mjsunit/wasm/data-segments.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");
 
 var debug = false;
 
 function SimpleDataSegmentTest(offset) {
   print("SimpleDataSegmentTest(" + offset + ")...");
   var builder = new WasmModuleBuilder();
   builder.addMemory(1, 1, false);
   builder.addFunction("load", kSig_i_i)
     .addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
     .exportAs("load");
   builder.addDataSegment(offset, [9, 9, 9, 9]);
 
   var buffer = builder.toBuffer(debug);
-  var instance = Wasm.instantiateModule(buffer);
+  var instance = new WebAssembly.Instance(new WebAssembly.Module(buffer));
   for (var i = offset - 20; i < offset + 20; i += 4) {
     if (i < 0) continue;
     var expected = (i == offset) ? 151587081 : 0;
     assertEquals(expected, instance.exports.load(i));
   }
 }
 
 SimpleDataSegmentTest(0);
 SimpleDataSegmentTest(4);
 SimpleDataSegmentTest(12);
 SimpleDataSegmentTest(1064);
 
 function GlobalInitTest(offset) {
   print("GlobalInitTest(" + offset + ")...");
   var builder = new WasmModuleBuilder();
   builder.addMemory(1, 1, false);
   var g = builder.addGlobal(kAstI32, false);
   g.init = offset;
   builder.addFunction("load", kSig_i_i)
     .addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
     .exportAs("load");
   builder.addDataSegment(g.index, [7, 7, 7, 7], true);
 
   var buffer = builder.toBuffer(debug);
-  var instance = Wasm.instantiateModule(buffer);
+  var instance = new WebAssembly.Instance(new WebAssembly.Module(buffer));
   for (var i = offset - 20; i < offset + 20; i += 4) {
     if (i < 0) continue;
     var expected = i == offset ? 117901063 : 0;
     assertEquals(expected, instance.exports.load(i));
   }
 }
 
 GlobalInitTest(0);
 GlobalInitTest(12);
 GlobalInitTest(3040);
@@ skipping 23 matching lines @@
       if (i < 0) continue;
       var expected = i == offset ? 84215045 : 0;
       assertEquals(expected, instance.exports.load(i));
     }
   }
 }
 
 GlobalImportedInitTest(0);
 GlobalImportedInitTest(1);
 GlobalImportedInitTest(4);