[lit] Remove Python 2.6 and below exec workaround

[modocache]

Summary

The minimum version of Python required to run LLVM's test suite is 2.7.
Remove a workaround for older Python versions.

utils/lit/lit/TestingConfig.py

 import os
 import sys
 
-OldPy = sys.version_info[0] == 2 and sys.version_info[1] < 7
 
 class TestingConfig:
     """"
     TestingConfig - Information on the tests inside a suite.
     """
 
     @staticmethod
     def fromdefaults(litConfig):
def load_from_path(self, path, litConfig):
         load_from_path(path, litConfig)
 
         Load the configuration module at the provided path into the given config
         object.
         """
 
         # Load the config script data.
         data = None
-        if not OldPy:
-            f = open(path)
-            try:
-                data = f.read()
-            except:
-                litConfig.fatal('unable to load config file: %r' % (path,))
-            f.close()
 
         # Execute the config script to initialize the object.
         cfg_globals = dict(globals())
         cfg_globals['config'] = self
         cfg_globals['lit_config'] = litConfig
         cfg_globals['__file__'] = path
         try:
-            if OldPy:
-                execfile(path, cfg_globals)
-            else:
-                exec(compile(data, path, 'exec'), cfg_globals, None)
             if litConfig.debug:
                 litConfig.note('... loaded config %r' % path)
         except SystemExit:
             e = sys.exc_info()[1]
             # We allow normal system exit inside a config file to just
             # return control without error.
             if e.args:
                 raise