[rth] Fix bug where single quotes can wrap single quotes

Author: lplarson

test/lit.cfg

@@ -752,12 +752,12 @@ config.target_sil_extract = (
     % (config.sil_extract, config.variant_triple, mcp_opt))
 
 config.target_resilience_test_wmo = (
-     ("%s --target-build-swift '%s' --target-run '%s' --t %%t --S %%S --s %%s "
-      "--additional-compile-flags-library '-whole-module-optimization -parse-as-library'")
+     ('%s --target-build-swift "%s" --target-run "%s" --t %%t --S %%S --s %%s '
+      '--additional-compile-flags-library "-whole-module-optimization -parse-as-library"')
      % (config.rth, config.target_build_swift, config.target_run))
 
 config.target_resilience_test = (
-     "%s --target-build-swift '%s' --target-run '%s' --t %%t --S %%S --s %%s"
+     '%s --target-build-swift "%s" --target-run "%s" --t %%t --S %%S --s %%s'
      % (config.rth, config.target_build_swift, config.target_run))
 
 #