Address Jordan's comments

Author: yln

test/Runtime/lazy_witness_table_cycle.swift

@@ -1,6 +1,6 @@
 // RUN: %target-run-simple-swift
 // REQUIRES: executable_test
-// REQUIRES: objc_interop
+// REQUIRES: foundation
 
 // SR-5958
 import Foundation

test/lit.cfg

@@ -919,10 +919,10 @@ elif run_os in ['linux-gnu', 'linux-gnueabihf', 'freebsd', 'windows-cygnus', 'wi
     if (all(os.path.exists(p) for p in libdispatch_build_artifacts)):
         config.available_features.add('libdispatch')
         config.libdispatch_build_dir = libdispatch_build_dir
-        source_dir = make_path(config.swift_src_root, os.pardir, 'swift-corelibs-libdispatch')
-        swift_module_dir = make_path(libdispatch_build_dir, 'swift')
+        libdispatch_source_dir = make_path(config.swift_src_root, os.pardir, 'swift-corelibs-libdispatch')
+        libdispatch_swift_module_dir = make_path(libdispatch_build_dir, 'swift')
         config.import_libdispatch = ('-I %s -I %s -L %s'
-            % (source_dir, swift_module_dir, libdispatch_build_dir))
+            % (libdispatch_source_dir, libdispatch_swift_module_dir, libdispatch_build_dir))
 
     config.target_build_swift = (
         '%s -target %s %s %s %s %s %s'