Enable incremental rustfmt adoption#65939

Merged

bors merged 7 commits intorust-lang:masterfrom

anp:incremental-rustfmt-rollout

Dec 22, 2019

Commits on Dec 22, 2019

Add individual crates to rustfmt ignore list.

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bootstrap.py fetches rustfmt.

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Implement `./x.py fmt [--check]`.

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Format src/librustc_fs_util.

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Include formatting check in the test step for tidy.

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Implement rustfmt running manually using ignore crate
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Do not run if rustfmt.toml does not exist
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