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Give a nicer error for non-Unicode arguments to rustc and rustdoc
Previously, any non-Unicode argument would panic rustc: ``` $ rustc $'foo\x80bar' error: internal compiler error: unexpected panic note: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: "foo�bar"', /checkout/src/libcore/result.rs:859 note: Run with `RUST_BACKTRACE=1` for a backtrace. ``` Now it gives a clean error: ``` $ rustc $'foo\x80bar' error: Argument 1 is not valid Unicode: "foo�bar" ``` Maybe fixes #15890, although we still can't *compile* arbitrary file names.
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