compatible for 32bit arm-linux

[walletiger]

error: 3rd/parallel-hashmap/parallel_hashmap/phmap_utils.h:324:16: error: right shift count >= width of type [-Werror=shift-count-overflow]
324 | k ^= k >> r;
| ~~^~~~

the type of k is size_t , r = 47 , in 32-bit linux k >> r , overflow , how to fix it !!

[greg7mdp]

Which compiler? This should be instantiated only when sizeof(size_t) == 8.