Guillem Nieto e0ccc9d9af Add slow zero-filled vector initialization lint ...

Add lint to detect slow zero-filled vector initialization. It detects
when a vector is zero-filled with extended with `repeat(0).take(len)`
or `resize(len, 0)`.
This zero-fillings are usually slower than simply using `vec![0; len]`.

2018-11-25 14:34:23 -08:00

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