Fix more warnings in wtf

Source/wtf/TCSystemAlloc.cpp

Index: Source/wtf/TCSystemAlloc.cpp
diff --git a/Source/wtf/TCSystemAlloc.cpp b/Source/wtf/TCSystemAlloc.cpp
index c631fda1f5f2c0bf7b32726b3c239a30cee311e9..98ac89b81427e245f90095c795dae63f2c5ae134 100644
--- a/Source/wtf/TCSystemAlloc.cpp
+++ b/Source/wtf/TCSystemAlloc.cpp
@@ -79,9 +79,6 @@ 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) {
@@ -184,11 +181,6 @@ void TCMalloc_SystemRelease(void* start, size_t length)
 #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;