implement __builtin_popcountll

zhenghaozrequested to merge
zhenghaoz/libc-deletion_scheduled-79454252:__builtin_popcountll into master

Add built-in functions: https://gcc.gnu.org/onlinedocs/gcc/Bit-Operation-Builtins.html

Built-in Function: int __builtin_popcountll (unsigned long long) Similar to __builtin_popcount, except the argument type is unsigned long long.

Merge request reports