[lit] Remove workaround for Python 2.5

[modocache]

Summary

The minimum version of Python necessary to run the LLVM test suite is
2.7. Code to work around Python 2.5 and lower isn't necessary.

[beanz]

LGTM.

[modocache]

Awesome, thanks! I don't have commit access, so as with the other diffs you accepted, I'd appreciate it if you could land this on my behalf. :)

[modocache]

OK, looks like this one hasn't been landed yet. Allow me to try. :)

utils/lit/lit/main.py

def main_with_tmp(builtinParameters):
     if opts.show_version:
         print("lit %s" % (lit.__version__,))
         return
 
     if not args:
         parser.error('No inputs specified')
 
     if opts.numThreads is None:
-# Python <2.5 has a race condition causing lit to always fail with numThreads>1
-# http://bugs.python.org/issue1731717
-# I haven't seen this bug occur with 2.5.2 and later, so only enable multiple
-# threads by default there.
-       if sys.hexversion >= 0x2050200:
-               opts.numThreads = lit.util.detectCPUs()
-       else:
-               opts.numThreads = 1
 
     if opts.maxFailures == 0:
         parser.error("Setting --max-failures to 0 does not have any effect.")
 
     inputs = args
 
     # Create the user defined parameters.
     userParams = dict(builtinParameters)