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

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 ';'
```

Reviewers: rnk, majnemer

Subscribers: majnemer, llvm-commits, chrisha, dberris

Differential Revision: https://reviews.llvm.org/D24810

llvm-svn: 282254

compiler-rt/lib/lsan/lsan_thread.cc

@@ -36,7 +36,7 @@ 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);
 }