Use `CHECK_OBJECT_COERCIBLE` macro where possible

src/harmony-array.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 17 matching lines @@
 'use strict';
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
 // -------------------------------------------------------------------
 
 // ES6 draft 07-15-13, section 15.4.3.23
 function ArrayFind(predicate /* thisArg */) {  // length == 1
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["Array.prototype.find"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.find");
 
   var array = ToObject(this);
   var length = ToInteger(array.length);
 
   if (!IS_SPEC_FUNCTION(predicate)) {
     throw MakeTypeError('called_non_callable', [predicate]);
   }
 
   var thisArg;
   if (%_ArgumentsLength() > 1) {
@@ skipping 14 matching lines @@
       }
     }
   }
 
   return;
 }
 
 
 // ES6 draft 07-15-13, section 15.4.3.24
 function ArrayFindIndex(predicate /* thisArg */) {  // length == 1
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["Array.prototype.findIndex"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.findIndex");
 
   var array = ToObject(this);
   var length = ToInteger(array.length);
 
   if (!IS_SPEC_FUNCTION(predicate)) {
     throw MakeTypeError('called_non_callable', [predicate]);
   }
 
   var thisArg;
   if (%_ArgumentsLength() > 1) {
@@ skipping 25 matching lines @@
   %CheckIsBootstrapping();
 
   // Set up the non-enumerable functions on the Array prototype object.
   InstallFunctions($Array.prototype, DONT_ENUM, $Array(
     "find", ArrayFind,
     "findIndex", ArrayFindIndex
   ));
 }
 
 HarmonyArrayExtendArrayPrototype();