bpo-41431: Optimize dict_merge for copy - #21669

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methane wants to merge 3 commits into

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methane:dict-copy2

Commits on Jul 27, 2020

Use empty key-sharing dict in dict_new
methane
committed
97f2089

Commits on Jul 28, 2020

Add dict_copy2
methane
committed
cf4f61c

Commits on Jul 29, 2020

Remove clone_combined_dict
methane
committed
4ac880b