[wasm] Fix receiver conversion for WASM->JS calls.

test/mjsunit/wasm/import-table.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");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 function testCallImport(func, check) {
@@ skipping 27 matching lines @@
   was_called = true;
   params[0] = this;
   params[1] = a;
   params[2] = b;
   return (a - b) | 0;
 }
 
 function check_FOREIGN_SUB(r, a, b) {
     assertEquals(a - b | 0, r);
     assertTrue(was_called);
-//    assertEquals(global, params[0]);  // sloppy mode
+    assertEquals(global, params[0]);  // sloppy mode
     assertEquals(a, params[1]);
     assertEquals(b, params[2]);
     was_called = false;
 }
 
 testCallImport(FOREIGN_SUB, check_FOREIGN_SUB);
 
 
 function FOREIGN_ABCD(a, b, c, d) {
   print("FOREIGN_ABCD(" + a + ", " + b + ", " + c + ", " + d + ")");
   was_called = true;
   params[0] = this;
   params[1] = a;
   params[2] = b;
   params[3] = c;
   params[4] = d;
   return (a * b * 6) | 0;
 }
 
 function check_FOREIGN_ABCD(r, a, b) {
     assertEquals((a * b * 6) | 0, r);
     assertTrue(was_called);
-//    assertEquals(global, params[0]);  // sloppy mode.
+    assertEquals(global, params[0]);  // sloppy mode.
     assertEquals(a, params[1]);
     assertEquals(b, params[2]);
     assertEquals(undefined, params[3]);
     assertEquals(undefined, params[4]);
     was_called = false;
 }
 
 testCallImport(FOREIGN_ABCD, check_FOREIGN_ABCD);
 
 function FOREIGN_ARGUMENTS0() {
@@ skipping 192 matching lines @@
       kExprCallImport, kArity0, 1, // --
       kExprI32Add,                 // --
     ])                             // --
     .exportFunc();
 
   var main = builder.instantiate({foo: foo, bar: bar}).exports.main;
   assertEquals(expected, main());
 }
 
 testCallImport2(function() { return 33; }, function () { return 44; }, 77);