To be useful for narrowing down bugs, --hydrogen-filter shouldn't prevent any
inlining that the function(s) being allowed to get optimized want(s) to do.

Free bonus content in this CL: support FLAG_stop_at in lithium-codegen-arm64,
copied from full-codegen-arm64.

Review URL: https://codereview.chromium.org/1407043004

Cr-Commit-Position: refs/heads/master@{#31333}