/usr/lib/gcc-cross/mips64-linux-gnuabi64/6/libcc1.so is in gcc-6-mips64-linux-gnuabi64 6.4.0-17ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/mips64-linux-gnuabi64/6/../../../x86_64-linux-gnu/libcc1.so.0