[scudo] Add initialization for TSDRegistrySharedT

[cferris]

Summary

Fixes compilation on Android which has a TSDSharedRegistry object in the config.

[vitalybuka]

I missed this one in D101514 because didn't compile for android.

compiler-rt/lib/scudo/standalone/tsd_shared.h

if (N > 1U) {
         return CandidateTSD;
       }
     }
     // Last resort, stick with the current one.
     CurrentTSD->lock();
     return CurrentTSD;
   }
 
-  atomic_u32 CurrentIndex;
-  u32 NumberOfTSDs;
-  u32 NumberOfCoPrimes;
-  u32 CoPrimes[TSDsArraySize];
-  bool Initialized;
+  atomic_u32 CurrentIndex = {};
+  u32 NumberOfTSDs = 0;
+  u32 NumberOfCoPrimes = 0;
+  u32 CoPrimes[TSDsArraySize] = {};
+  bool Initialized = false;
   HybridMutex Mutex;
   HybridMutex MutexTSDs;
   TSD<Allocator> TSDs[TSDsArraySize];
 };
 
 } // namespace scudo
 
 #endif // SCUDO_TSD_SHARED_H_