[asan] Remove AsanPlatformThreadInit

[rnk]

Summary

Since the CoreFoundation allocator replacement was moved in r173134, all
implementations of this function have been empty.

[samsonov]

LGTM

compiler-rt/trunk/lib/asan/asan_internal.h

 void AsanCheckDynamicRTPrereqs();
 void AsanCheckIncompatibleRT();
 
 void AsanOnSIGSEGV(int, void *siginfo, void *context);
 
 void DisableReexec();
 void MaybeReexec();
 void ReadContextStack(void *context, uptr *stack, uptr *ssize);
-void AsanPlatformThreadInit();
 void StopInitOrderChecking();
 
 // Wrapper for TLS/TSD.
 void AsanTSDInit(void (*destructor)(void *tsd));
 void *AsanTSDGet();
 void AsanTSDSet(void *tsd);
 void PlatformTSDDtor(void *tsd);
 

compiler-rt/trunk/lib/asan/asan_linux.cc

if (__asan_rt_version == ASAN_RT_VERSION_UNDEFINED) {
       __asan_rt_version = ASAN_RT_VERSION_STATIC;
     } else if (__asan_rt_version != ASAN_RT_VERSION_STATIC) {
       ReportIncompatibleRT();
     }
   }
 }
 #endif  // SANITIZER_ANDROID
 
-void AsanPlatformThreadInit() {
-  // Nothing here for now.
-}
-
 #if !SANITIZER_ANDROID
 void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
   ucontext_t *ucp = (ucontext_t*)context;
   *stack = (uptr)ucp->uc_stack.ss_sp;
   *ssize = ucp->uc_stack.ss_size;
 }
 #else
 void ReadContextStack(void *context, uptr *stack, uptr *ssize) {

compiler-rt/trunk/lib/asan/asan_mac.cc

 }
 
 // No-op. Mac does not support static linkage anyway.
 void AsanCheckDynamicRTPrereqs() {}
 
 // No-op. Mac does not support static linkage anyway.
 void AsanCheckIncompatibleRT() {}
 
-void AsanPlatformThreadInit() {
-}
-
 void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
   UNIMPLEMENTED();
 }
 
 // Support for the following functions from libdispatch on Mac OS:
 //   dispatch_async_f()
 //   dispatch_async()
 //   dispatch_sync_f()

compiler-rt/trunk/lib/asan/asan_thread.cc

void AsanThread::Init() {
   CHECK_GT(this->stack_size(), 0U);
   CHECK(AddrIsInMem(stack_bottom_));
   CHECK(AddrIsInMem(stack_top_ - 1));
   ClearShadowForThreadStackAndTLS();
   int local = 0;
   VReport(1, "T%d: stack [%p,%p) size 0x%zx; local=%p\n", tid(),
           (void *)stack_bottom_, (void *)stack_top_, stack_top_ - stack_bottom_,
           &local);
-  AsanPlatformThreadInit();
 }
 
 thread_return_t AsanThread::ThreadStart(
     uptr os_id, atomic_uintptr_t *signal_thread_is_registered) {
   Init();
   asanThreadRegistry().StartThread(tid(), os_id, 0);
   if (signal_thread_is_registered)
     atomic_store(signal_thread_is_registered, 1, memory_order_release);

compiler-rt/trunk/lib/asan/asan_win.cc

 #endif
   return 0;
 }
 
 void AsanCheckDynamicRTPrereqs() {}
 
 void AsanCheckIncompatibleRT() {}
 
-void AsanPlatformThreadInit() {
-  // Nothing here for now.
-}
-
 void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
   UNIMPLEMENTED();
 }
 
 void AsanOnSIGSEGV(int, void *siginfo, void *context) {
   UNIMPLEMENTED();
 }