Prevent icf/comdat folding for OOM_CRASH() entry points.

base/allocator/oom.h

 // Copyright (c) 2016 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.
 
 #ifndef BASE_ALLOCATOR_OOM_H
 #define BASE_ALLOCATOR_OOM_H
 
 #include "base/logging.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
+// Do not want trivial entry points just calling OOM_CRASH() to be
+// commoned up by linker icf/comdat folding.
+#define OOM_CRASH_PREVENT_ICF()                  \
+  volatile int oom_crash_inhibit_icf = __LINE__; \
+  ALLOW_UNUSED_LOCAL(oom_crash_inhibit_icf)
+
 // OOM_CRASH() - Specialization of IMMEDIATE_CRASH which will raise a custom
 // exception on Windows to signal this is OOM and not a normal assert.
 #if defined(OS_WIN)
 #define OOM_CRASH()                                                     \
   do {                                                                  \
+    OOM_CRASH_PREVENT_ICF();                                            \
     ::RaiseException(0xE0000008, EXCEPTION_NONCONTINUABLE, 0, nullptr); \
     IMMEDIATE_CRASH();                                                  \
   } while (0)
 #else
-#define OOM_CRASH() IMMEDIATE_CRASH()
+#define OOM_CRASH()          \
+  do {                       \
+    OOM_CRASH_PREVENT_ICF(); \
+    IMMEDIATE_CRASH();       \
+  } while (0)
 #endif
 
 #endif  // BASE_ALLOCATOR_OOM_H