compiler: Let cloned test suites run under other build systems

Some compiler test suites get cloned so they can be built with
different compiler options. When building tests with make, they
need to share the data dir, and test_lib:get_data_dir/1 does the
conversion.

However, if we try to run these tests under a different build
system (e.g. buck, but possibly the same would happen with rebar3)
then it is more convenient to let the build system handle the
aliasing of data-dir, and in that case the adapter should do
nothing

Author: jcpetruzza

lib/compiler/test/test_lib.erl

@@ -135,10 +135,16 @@ get_data_dir(Config) ->
                 "_no_type_opt_SUITE",
                 "_no_ssa_opt_SUITE",
                 "_cover_SUITE"],
-    lists:foldl(fun(Suffix, Acc) ->
-                        Opts = [{return,list}],
-                        re:replace(Acc, Suffix, "_SUITE", Opts)
-                end, Data, Suffixes).
+    case filelib:is_dir(Data) of
+        true ->
+            %% Build system already provides it
+            Data;
+        false ->
+            lists:foldl(fun(Suffix, Acc) ->
+                                Opts = [{return,list}],
+                                re:replace(Acc, Suffix, "_SUITE", Opts)
+                        end, Data, Suffixes)
+    end.
 
 %% Test whether the module is cloned. We don't consider modules
 %% compiled with compatibility for an older release cloned (that