git_mapfile.save_map: stop sorting the keys entirely
There really is no point to this -- the sorting is expensive to compute and the structure is never actually used. For a mapfile with 1.5 million entries, this speeds up save_map from 3.6 seconds to 0.87. This is probably the limit of the speedups we can get with pure-Python code. Any further speedups will have to be made by rewriting these bits in C.
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