Run recover_comment_removed() only if the text changed after format #1980
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since we will be using the original snippet no matter what.
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One of the most time consuming function in rustfmt is
recover_comment_removed(). E.g. it takes up roughly 20% of the execution time when running rustfmt against librustc.This PR attempts to avoid expensive recover procedure whenever possible by comparing the equality of original text and formatted text.
cc #338