[wasm] Rename the WASM object to _WASMEXP_.

test/mjsunit/wasm/params.js

Index: test/mjsunit/wasm/params.js
diff --git a/test/mjsunit/wasm/params.js b/test/mjsunit/wasm/params.js
index 2a23beb3ab88ac7ac7c681bb5e2e9ea47cb18cb7..52d62147510c39a54f983caad0031aee9fe45296 100644
--- a/test/mjsunit/wasm/params.js
+++ b/test/mjsunit/wasm/params.js
@@ -35,7 +35,7 @@ function testSelect2(type) {
       's','e','l','e','c','t',0   // name
     );
 
-    var module = WASM.instantiateModule(data);
+    var module = _WASMEXP_.instantiateModule(data);
 
     assertEquals("function", typeof module.select);
     runSelect2(module, which, 99, 97);
@@ -111,7 +111,7 @@ function testSelect10(type) {
       's','e','l','e','c','t',0   // name
     );
 
-    var module = WASM.instantiateModule(data);
+    var module = _WASMEXP_.instantiateModule(data);
 
     assertEquals("function", typeof module.select);
     runSelect10(module, which, 99, 97);