debug relocatedepot re-precompilation

Author: IanButterworth

test/relocatedepot.jl

@@ -13,7 +13,9 @@ function test_harness(@nospecialize(fn); empty_load_path=true, empty_depot_path=
     try
         empty_load_path && empty!(LOAD_PATH)
         empty_depot_path && empty!(DEPOT_PATH)
-        fn()
+        withenv("JULIA_DEBUG" => "loading") do
+            fn()
+        end
     finally
         copy!(LOAD_PATH, load_path)
         copy!(DEPOT_PATH, depot_path)