Bring back path loading optimization and remove stale test

Author: josevalim

lib/mix/lib/mix/tasks/compile.ex

@@ -151,7 +151,7 @@ defmodule Mix.Tasks.Compile do
 
     # We run loadpaths to perform checks but we don't bother setting
     # up the load paths because compile.all will manage them anyway.
-    Mix.Task.run("loadpaths", ["--no-deps-loading" | args])
+    Mix.Task.run("loadpaths", ["--no-path-loading" | args])
 
     {opts, _, _} = OptionParser.parse(args, switches: [erl_config: :string])
     load_erl_config(opts)

lib/mix/test/mix/tasks/deps_test.exs

@@ -282,36 +282,6 @@ defmodule Mix.Tasks.DepsTest do
     end)
   end
 
-  test "does not load deps with --no-deps-loading" do
-    in_fixture("deps_status", fn ->
-      Mix.Project.push(SuccessfulDepsApp)
-
-      # Start from scratch!
-      File.rm_rf("_build")
-
-      Mix.Tasks.Deps.Compile.run([])
-      Mix.Tasks.Deps.Loadpaths.run([])
-      assert File.exists?("_build/dev/lib/ok/ebin/ok.app")
-      assert File.exists?("_build/dev/lib/ok/priv/sample")
-
-      Mix.Tasks.Compile.run([])
-      assert to_charlist(Path.expand("_build/dev/lib/ok/ebin/")) in :code.get_path()
-      assert File.exists?("_build/dev/lib/sample/ebin/sample.app")
-
-      # Remove the deps without build_path
-      Mix.ProjectStack.post_config(deps: [])
-      Mix.State.clear_cache()
-      Mix.Project.pop()
-      Mix.Project.push(SuccessfulDepsApp)
-      Code.delete_path("_build/dev/lib/ok/ebin")
-
-      Mix.Tasks.Deps.Loadpaths.run(["--no-deps-loading"])
-      refute to_charlist(Path.expand("_build/dev/lib/ok/ebin/")) in :code.get_path()
-      assert File.exists?("_build/dev/lib/ok/ebin/ok.app")
-      assert File.exists?("_build/dev/lib/sample/ebin/sample.app")
-    end)
-  end
-
   ## deps.unlock
 
   test "unlocks all deps", context do