Summary:
Add a microbenchmark for thread cache misses.

Add member function evict to hazptr_tc.

Add free function hazptr_tc_evict for use in testing and benchmarking only.

Remove the warning for thread cache overflow.

Add member function delete_hazard_pointers to hazptr_domain to be used only for testing and benchmarking.

## Microbenchmark Results

Results for TC hits and misses under an extreme case of 10000 in-use hazard pointers:
```
10x construct/destruct hazptr_array<9>            105 ns     97 ns     95 ns
1/1000 TC hit + miss & overflow                   550 ns    502 ns    468 ns
```

The latency for constructing/destroying a 9-hazard-pointer-array from TC hits is about 10 ns.

The latency for constructing/destroying two 9-hazard-pointer-arrays from one TC hit and one TC miss/overflow is about 500 us (i.e., 500,000 ns).

Reviewed By: yfeldblum

Differential Revision: D31102027

fbshipit-source-id: dee7333d77ebde25dcf18c6af72cc04e99788e43