PartitionAlloc: Distinguish OOMs where a lot of super pages are not committed

Source/wtf/Assertions.h

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 116 matching lines @@
 
 /* IMMEDIATE_CRASH() - Like CRASH() below but crashes in the fastest, simplest possible way with no attempt at logging. */
 #ifndef IMMEDIATE_CRASH
 #if COMPILER(GCC)
 #define IMMEDIATE_CRASH() __builtin_trap()
 #else
 #define IMMEDIATE_CRASH() ((void(*)())0)()
 #endif
 #endif
 
+// IMMEDIATE_CRASH_WITH_FLAG() - Like IMMEDIATE_CRASH() above but try to crash at a specified address to be distinguished in crash reports.
+#ifndef IMMEDIATE_CRASH_WITH_FLAG
+#if COMPILER(GCC)
+#define IMMEDIATE_CRASH_WITH_FLAG(FLAG) IMMEDIATE_CRASH()
+#else
+#define IMMEDIATE_CRASH_WITH_FLAG(FLAG) (((void(*)())((FLAG) & 0xfff))(), IMMEDIATE_CRASH())
+#endif
+#endif
+
 /* CRASH() - Raises a fatal error resulting in program termination and triggering either the debugger or the crash reporter.
 
    Use CRASH() in response to known, unrecoverable errors like out-of-memory.
    Macro is enabled in both debug and release mode.
    To test for unknown errors and verify assumptions, use ASSERT instead, to avoid impacting performance in release builds.
 
    Signals are ignored by the crash reporter on OS X so we must do better.
 */
 #ifndef CRASH
 #define CRASH() \
@@ skipping 258 matching lines @@
 } \
 inline const thisType& to##thisType(const argumentType& argumentName) \
 { \
     ASSERT_WITH_SECURITY_IMPLICATION(referencePredicate); \
     return static_cast<const thisType&>(argumentName); \
 } \
 void to##thisType(const thisType*); \
 void to##thisType(const thisType&)
 
 #endif /* WTF_Assertions_h */