tsan: fix android build

[dvyukov]

Summary

Builders reported build breakage after commit
"sanitizer_common: introduce kInvalidTid/kMainTid":

tsan_platform_linux.cpp:500:10: error: const_cast from

'const __sanitizer::u32 *' (aka 'const unsigned int *')
to 'int *' is not allowed

https://lab.llvm.org/buildbot#builders/77/builds/5984

Fix tid type and const.

[vitalybuka]

Didn't noticed review and fixed this cbd5aceb6296956387157fea9b13f49c932b8813 already.
It's OK to land fixes like this without review.

compiler-rt/lib/tsan/rtl/tsan_platform_linux.cpp

if (thr == nullptr) {
                                                      "ThreadState"));
       *get_android_tls_ptr() = reinterpret_cast<uptr>(thr);
       if (dead_thread_state == nullptr) {
         dead_thread_state = reinterpret_cast<ThreadState*>(
             MmapOrDie(sizeof(ThreadState), "ThreadState"));
         dead_thread_state->fast_state.SetIgnoreBit();
         dead_thread_state->ignore_interceptors = 1;
         dead_thread_state->is_dead = true;
-        *const_cast<int*>(&dead_thread_state->tid) = -1;
+        *const_cast<u32 *>(&dead_thread_state->tid) = kInvalidTid;
         CHECK_EQ(0, internal_mprotect(dead_thread_state, sizeof(ThreadState),
                                       PROT_READ));
       }
     }
     CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, &oldset, nullptr));
   }
   return thr;
 }