Attrcache cleanups - #4131
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Improve encapsulation by not referencing the attrcache mutex directly but instead using the `attr_cache_lock` and `attr_cache_unlock` functions.
When doing an upsert of a file, we used to use `git__compare_and_swap`, comparing the entry's file which is to be replaced with itself. This can be more easily formulated by using `git__swap`, which unconditionally replaces the value.
Remove useless indirection from `git_attr_cache__init` to `git_attr_cache__do_init`. The difference is that the `git_attr_cache__init` macro first checks if the cache is already initialized and, if so, not call `git_attr_cache__do_init`. But actually, `git_attr_cache__do_init` already does the same thing and returns immediately if the cache is already initialized. Remove the indirection.
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After several hours of staring at multi-threaded attrcache, this is the depressing outcome: a few fixes to small stylistic nits which have already been bothering me the last few times I took a look at the code :/ Well, better than nothing...