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Summary:
optparse is deprecated in Python 2.7, which is the minimum version of
Python required to run the LLVM test suite. Replace its usage in lit
with argparse, optparse's 2.7 replacement module.
argparse has several benefits over optparse, but this commit does not
make use of those benefits yet. Instead, it simply uses the new API,
and attempts to keep the number of changes to a minimum.
Confirmed that lit's test suite, as well as LLVM's regression test suite,
still pass with these changes.
Patch By Brian Gesiak!
Reviewers: ddunbar, echristo, beanz, delcypher
Subscribers: llvm-commits, mehdi_amini
Differential Revision: https://reviews.llvm.org/D25173
llvm-svn: 283152
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