Minor refactoring/modernization/reintegration/enhancement of --pretty.#23017

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eddyb wants to merge 11 commits intorust-lang:masterfrom

eddyb:pretty-dump-dir

Commits on Mar 4, 2015

rustc_driver: hold references to contexts, instead of owning them, in pretty-printing annotators.
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rustc: clean up a couple of workarounds that predate `FnOnce`.
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rustc_driver: refactor PrinterSupport away by localizing ownership to pretty_print_input.
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rustc_driver: move pretty-printing to the new driver controller API.
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rustc_driver: add -Z pretty-keep-going to continue compilation after pretty-printing.
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rustc_driver: add -Z pretty-dump-dir to specify a directory for bulk --pretty dumps.
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rustc_driver: use `(expr: T)` in --pretty=typed, instead of `(expr as T)`, as the latter might compile some day.
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syntax: support customization of literals in pretty-printing annotators.
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rustc_driver: add --xpretty typed,unsuffixed_literals (integers and floats).
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rustdoc::test: use build_controller, rather than setting up CompileController manually.
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rustc_driver: add env var RUSTC_PRETTY_DUMP=mode:dir which acts like --xpretty=mode -Z pretty-keep-going -Z pretty-dump-dir=dir.
eddyb
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