Fix ExhaustMemory on clang.

content/renderer/render_frame_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 407 matching lines @@
   // as a browser initiated event.  Instead, we want it to look as if the page
   // initiated any load resulting from JS execution.
   return pending &&
          !pending->common_params.url.SchemeIs(url::kJavaScriptScheme);
 }
 
 NOINLINE void ExhaustMemory() {
   volatile void* ptr = nullptr;
   do {
     ptr = malloc(0x10000000);
+    base::debug::Alias(&ptr);
   } while (ptr);
 }
 
 NOINLINE void CrashIntentionally() {
   // NOTE(shess): Crash directly rather than using NOTREACHED() so
   // that the signature is easier to triage in crash reports.
   //
   // Linker's ICF feature may merge this function with other functions with the
   // same definition and it may confuse the crash report processing system.
   static int static_variable_to_make_this_function_unique = 0;
@@ skipping 6390 matching lines @@
   // event target. Potentially a Pepper plugin will receive the event.
   // In order to tell whether a plugin gets the last mouse event and which it
   // is, we set |pepper_last_mouse_event_target_| to null here. If a plugin gets
   // the event, it will notify us via DidReceiveMouseEvent() and set itself as
   // |pepper_last_mouse_event_target_|.
   pepper_last_mouse_event_target_ = nullptr;
 #endif
 }
 
 }  // namespace content