Running rustfmt on rust-lang/rust and other rust-lang repositories

tools and infrastructure
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use_small_heuristics = "Max" is confirmed to work great on my code and reduce churn.

Here are some stats from formatting changes:
use_small_heuristics = "Default"

src/librustc_privacy/lib.rs                 |  574 ++++--
src/librustc_resolve/build_reduced_graph.rs |  576 ++++--
src/librustc_resolve/check_unused.rs        |   65 +-
src/librustc_resolve/error_reporting.rs     |   46 +-
src/librustc_resolve/lib.rs                 | 2756 ++++++++++++++++-----------
src/librustc_resolve/macros.rs              |  646 +++++--
src/librustc_resolve/resolve_imports.rs     | 1008 ++++++----

use_small_heuristics = "Max"

src/librustc_privacy/lib.rs                 |  466 ++---
src/librustc_resolve/build_reduced_graph.rs |  463 +++--
src/librustc_resolve/check_unused.rs        |   55 +-
src/librustc_resolve/error_reporting.rs     |   23 +-
src/librustc_resolve/lib.rs                 | 2426 +++++++++++++++------------
src/librustc_resolve/macros.rs              |  555 +++---
src/librustc_resolve/resolve_imports.rs     |  913 ++++++----

The remaining churn is mostly the switch from visual indentation to block indentation, which is okay and expected, and is indeed a consensus of the style RFC process.

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