use lz4 compression for improving buildbot performance for new buildbot for build.webkit.org. Similar to https://bugs.webkit.org/show_bug.cgi?id=196155
Created attachment 414714 [details] Patch
<rdar://problem/71747757>
Committed r270201: <https://trac.webkit.org/changeset/270201> All reviewed patches have been landed. Closing bug and clearing flags on attachment 414714 [details].