Update the sanity limit from 200M to 220M per file.
Update the sanity limit from 200M to 220M per file.

This is needed because the librustc_driver-*.so filesize on some targets
now exceed 200M. i.e. nightly-mips64el-unknown-linux-gnuabi64

This will close #2362.

The commit e23a7be3d39cf9d3b0f99626f20ce699b611ff15 , in which we lift the limit
from 100M to 200M, was commited 9 monthes ago. Thus we can estimate that the
driver size will grow 10M per month on nightly-mips64el target. With extra 20M
limit, we will be able to perform a better solution in about 2 monthes.

Signed-off-by: LIU An <f69d2218afd411ec13a1fe103273a04ceafb3f85@sgcc.com.cn>

rust-lang/rustup,inejge/rustup.rs,nodakai/rustup.rs,inejge/rustup.rs,rust-lang/rustup,inejge/rustup.rs,rust-lang/rustup,nodakai/rustup.rs,nodakai/rustup.rs,nodakai/rustup.rs,nodakai/rustup.rs,inejge/rustup.rs,rust-lang/rustup,inejge/rustup.rs,rust-lang/rustup