[Patch] Add a cl.exe compatible driver mode

[Hans Wennborg]

Hi all,

The attached patch adds a cl.exe compatible mode to the driver. It
doesn't actually do anything yet, but the plan is to make it accept
cl.exe style command line flags as discussed in [1].

Please take a look!

Thanks,
Hans

[1]. http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-June/030439.html
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