d9bc16cf36
rustdoc: Support argument files
Factors out the `rustc_driver` logic that handles argument files so that rustdoc supports them as well, e.g.:
rustdoc `@argfile`
This is needed to be able to generate docs for projects that already use argument files when compiling them, e.g. projects that pass a huge number of `--cfg` arguments.
The feature was stabilized for `rustc` in #66172.
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