Allow multiple lines of custom flags in javascript tests.

test/mjsunit/testcfg.py

 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 38 matching lines @@
     return "%s %s" % (self.mode, self.GetName())
 
   def GetName(self):
     return self.path[-1] + ["", "-isolates"][self.isolates]
 
   def TestsIsolates(self):
     return self.isolates
 
   def GetVmCommand(self, source):
     result = self.config.context.GetVmCommand(self, self.mode)
-    flags_match = FLAGS_PATTERN.search(source)
-    if flags_match:
-      result += flags_match.group(1).strip().split()
+    flags_match = re.findall(FLAGS_PATTERN, source);
+    for match in flags_match:
+      result += match.strip().split()
     return result
 
   def GetVmArguments(self, source):
     result = []
     additional_files = []
     files_match = FILES_PATTERN.search(source);
     # Accept several lines of 'Files:'
     while True:
       if files_match:
         additional_files += files_match.group(1).strip().split()
@@ skipping 77 matching lines @@
 
   def GetTestStatus(self, sections, defs):
     status_file = join(self.root, 'mjsunit.status')
     if exists(status_file):
       test.ReadConfigurationInto(status_file, sections, defs)
 
 
 
 def GetConfiguration(context, root):
   return MjsunitTestConfiguration(context, root)