Fix more warnings in wtf

Source/wtf/TCSystemAlloc.cpp

 // Copyright (c) 2005, 2007, 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:
 //
 //     * 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
@@ skipping 61 matching lines @@
 
 #if HAVE(MMAP)
 static bool use_mmap = true;
 #endif
 
 // Flags to keep us from retrying allocators that failed.
 static bool devmem_failure = false;
 static bool sbrk_failure = false;
 static bool mmap_failure = false;
 
-static const int32_t FLAGS_malloc_devmem_start = 0;
-static const int32_t FLAGS_malloc_devmem_limit = 0;
-
 #if HAVE(MMAP)
 
 static void* TryMmap(size_t size, size_t *actual_size, size_t alignment) {
   // Enforce page alignment
   if (pagesize == 0) pagesize = getpagesize();
   if (alignment < pagesize) alignment = pagesize;
   size = ((size + alignment - 1) / alignment) * alignment;
 
   // could theoretically return the "extra" bytes here, but this
   // is simple and correct.
@@ skipping 82 matching lines @@
 
 void TCMalloc_SystemRelease(void* start, size_t length)
 {
     // MADV_FREE clears the modified bit on pages, which allows
     // them to be discarded immediately.
 #if HAVE(MADV_FREE)
     const int advice = MADV_FREE;
 #else
     const int advice = MADV_DONTNEED;
 #endif
-  if (FLAGS_malloc_devmem_start) {
-    // It's not safe to use MADV_DONTNEED if we've been mapping
-    // /dev/mem for heap memory
-    return;
-  }
   if (pagesize == 0) pagesize = getpagesize();
   const size_t pagemask = pagesize - 1;
 
   size_t new_start = reinterpret_cast<size_t>(start);
   size_t end = new_start + length;
   size_t new_end = end;
 
   // Round up the starting address and round down the ending address
   // to be page aligned:
   new_start = (new_start + pagesize - 1) & ~pagemask;
@@ skipping 40 matching lines @@
 
 #else
 
 // Platforms that don't need to explicitly commit memory use an empty inline version of TCMalloc_SystemCommit
 // declared in TCSystemAlloc.h
 
 #endif
 
 #endif // #if !USE(SYSTEM_MALLOC)