Convert runtime atomics functions to inline asm

src/runtime/runtime-atomics-ia32-inl.h

Index: src/runtime/runtime-atomics-ia32-inl.h
diff --git a/test/mjsunit/compiler/regress-572409.js b/src/runtime/runtime-atomics-ia32-inl.h
similarity index 59%
copy from test/mjsunit/compiler/regress-572409.js
copy to src/runtime/runtime-atomics-ia32-inl.h
index 126b622625ad4455b4bd2e309ee10e32eb02989e..79a12c16f78d3db177b127072c920a26db62e5ae 100644
--- a/test/mjsunit/compiler/regress-572409.js
+++ b/src/runtime/runtime-atomics-ia32-inl.h
@@ -2,9 +2,5 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var o = function() {};
-function f() {
-  var lit = { __proto__: o  };
-  o instanceof RegExp;
-}
-f();
+// TODO(binji): is the ia32 implementation always the same as x64?
+#include "src/runtime/runtime-atomics-x64-inl.h"