Format sym_extract.py output to minimize diff output.

 Different versions of python print dictionaries in different orders.
 This can mess up diffs when updating ABI lists. This patch uses
 pprint.pformat to print the dicts to get a consistent ordering.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@353634 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed