[rust-dev] internal command line options

[Niko Matsakis]

I changed rustc so that options that are intended to aid in debugging 
rustc are now prefixed with -Z and do not appear in the default --help 
screen.

So, for example, if you want to time the rustc passes, you do:
    rustc -Z time-passes foo.rs

If you want to find out all of the internal options, do:

    rustc -Z help




Niko
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