lit.cfg: Scan command lines to verify tool names

[Daniel Dunbar]

I'm ok with this, it's gross but matches what LLVM is already doing.

 - Daniel


On Fri, Mar 21, 2014 at 10:58 AM, Robinson, Paul <
Paul_Robinson at playstation.sony.com> wrote:

> Add code to clang/test/lit.cfg matching what's in llvm/test/lit.cfg
> (as modified by r204486).  This processes the RUN: command line to
> ensure tools come from the current build directory.
> --paulr
>
>
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