[compiler-rt][lsan] Fix compiler error due to attribute (windows)

[etienneb]

Summary

Window compiler is stricter for attributes location. This patch fixes a compilation error.

D:\src\llvm\llvm\projects\compiler-rt\lib\lsan\lsan_thread.cc(39): error C2144: syntax error: 'int' should be preceded by ';'

[majnemer]

LGTM

lib/lsan/lsan_thread.cc

static ThreadContextBase *CreateThreadContext(u32 tid) {
   void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
   return new(mem) ThreadContext(tid);
 }
 
 static const uptr kMaxThreads = 1 << 13;
 static const uptr kThreadQuarantineSize = 64;
 
 void InitializeThreadRegistry() {
-  static char thread_registry_placeholder[sizeof(ThreadRegistry)] ALIGNED(64);
+  static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
   thread_registry = new(thread_registry_placeholder)
     ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
 }
 
 u32 GetCurrentThread() {
   return current_thread_tid;
 }