Add --enable-wasm to wasm tests.

test/mjsunit/wasm/params.js

 // Copyright 2015 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");
 
 function runSelect2(module, which, a, b) {
   assertEquals(which == 0 ? a : b, module.select(a, b));
 }
 
 function testSelect2(type) {
   var kBodySize = 2;
   var kNameOffset = 21 + kBodySize + 1;
 
@@ skipping 113 matching lines @@
       runSelect10(module, which, -1.25, 5.25);
       runSelect10(module, which, Infinity, -Infinity);
     }
   }
 }
 
 
 testSelect10(kAstI32);
 testSelect10(kAstF32);
 testSelect10(kAstF64);