Revert "Hack out build of lli tool from autoconf build"

This reverts commit 28d173e84a23f5a62a6674dbe68457e50f62b61d.

Reason for revert: Breaks the regression tests.

Change-Id: Id5e0d4bb3d03ea7366a5746aa73dbf1f0a46d6f0
Reviewed-on: https://chromium-review.googlesource.com/c/1361944
Reviewed-by: Derek Schuff <dschuff@chromium.org>