[presubmit] Enable runtime/threadsafe_fn linter checking.

src/base/platform/platform-aix.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform specific code for AIX goes here. For the POSIX comaptible parts
 // the implementation is in platform-posix.cc.
 
 #include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
@@ skipping 28 matching lines @@
 static inline void* mmapHelper(size_t len, int prot, int flags, int fildes,
                                off_t off) {
   void* addr = OS::GetRandomMmapAddr();
   return mmap(addr, len, prot, flags, fildes, off);
 }
 
 
 const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
   if (std::isnan(time)) return "";
   time_t tv = static_cast<time_t>(floor(time / msPerSecond));
-  struct tm* t = localtime(&tv);
+  struct tm* t = localtime(&tv);  // NOLINT(runtime/threadsafe_fn)
   if (NULL == t) return "";
   return tzname[0];  // The location of the timezone string on AIX.
 }
 
 
 double OS::LocalTimeOffset(TimezoneCache* cache) {
   // On AIX, struct tm does not contain a tm_gmtoff field.
   time_t utc = time(NULL);
   DCHECK(utc != -1);
-  struct tm* loc = localtime(&utc);
+  struct tm* loc = localtime(&utc);  // NOLINT(runtime/threadsafe_fn)
   DCHECK(loc != NULL);
   return static_cast<double>((mktime(loc) - utc) * msPerSecond);
 }
 
 
 void* OS::Allocate(const size_t requested, size_t* allocated, bool executable) {
   const size_t msize = RoundUp(requested, getpagesize());
   int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0);
   void* mbase = mmapHelper(msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 
@@ skipping 164 matching lines @@
 
 
 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
   return munmap(base, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() { return true; }
 }
 }  // namespace v8::base