Currently once lldbWebKitTester is built for the active configuration (see script set-webkit-configuration) then it is never rebuilt by test-webkitpy regardless of whether the source for lldbWebKitTester has changed.
Created attachment 344037 [details] Patch
Comment on attachment 344037 [details] Patch r=me
Committed r233407: <https://trac.webkit.org/changeset/233407>
<rdar://problem/41688400>
Thanks for the fix!