[tsan] one more explicit memset in tsan rtl (to please gcc 4.8.2)

llvm-svn: 199216

compiler-rt/lib/tsan/rtl/tsan_vector.h

@@ -82,7 +82,7 @@ class Vector {
     EnsureSize(size);
     if (old_size < size) {
       for (uptr i = old_size; i < size; i++)
-        begin_[i] = T();
+        internal_memset(&begin_[i], 0, sizeof(begin_[i]));
     }
   }