testing: Don't run swift_interpreter and swift_repl tests in only_non_executable mode

Author: aschwaighofer

test/lit.cfg

@@ -535,10 +535,12 @@ if config.variant_sdk != "":
 if platform.system() == 'Darwin' and (run_os == 'macosx' or run_os == 'darwin'):
     # Disable REPL tests if SDK overlay is not in the resource dir.
     # <rdar://problem/16678410> Adding more libraries with -lfoo to REPL is broken
-    config.available_features.add('swift_repl')
-    config.available_features.add('swift_interpreter')
+    if swift_test_mode != 'only_non_executable':
+      config.available_features.add('swift_repl')
+      config.available_features.add('swift_interpreter')
 elif platform.system() == 'Linux':
-    config.available_features.add('swift_interpreter')
+    if swift_test_mode != 'only_non_executable':
+      config.available_features.add('swift_interpreter')
 
 # swift-remoteast-test requires the ability to compile and run code
 # for the system we compiled the swift-remoteast-test executable on.