lit.cfg: fix a bug in simulator target

Author: Joe Shajrawi

test/lit.cfg

@@ -605,6 +605,10 @@ def use_interpreter_for_simple_runs():
     config.target_run_simple_swift = make_simple_target_run()
     config.available_features.add('interpret')
 
+target_specific_module_triple = config.variant_triple
+
+config.target_run = ""
+
 if run_vendor == 'apple':
     config.available_features.add('objc_interop')
     config.target_object_format = "macho"
@@ -1193,7 +1197,8 @@ if not kIsWindows:
 			"/usr/bin/env "
 			"DYLD_LIBRARY_PATH='{0}' " # Apple option
 			"LD_LIBRARY_PATH='{0}' " # Linux option
-			.format(target_stdlib_path))
+			"SIMCTL_CHILD_DYLD_LIBRARY_PATH='{0}' " # Simulator option
+			.format(target_stdlib_path)) + config.target_run
 	else:
 		os_stdlib_path = ''
 		if run_vendor == 'apple':
@@ -1205,7 +1210,8 @@ if not kIsWindows:
 			"/usr/bin/env "
 			"DYLD_LIBRARY_PATH='{0}' " # Apple option
 			"LD_LIBRARY_PATH='{0}' " # Linux option
-			.format(all_stdlib_path))
+			"SIMCTL_CHILD_DYLD_LIBRARY_PATH='{0}' " # Simulator option
+			.format(all_stdlib_path)) + config.target_run
 
 #
 # When changing substitutions, update docs/Testing.rst.