[PATCH] lit.cfg - don't substitute llc tool name if prefixed by a '-'

[Eli Bendersky]

This small patch teaches lit not to perform RUN line substitution of llc if
that's prefixed by a dash (-llc), similarly to the way it was done for
clang and llvmc.

This doesn't affect the upstream llvm tests but helps when developing
custom LLVM-based tools and testing them within the LLVM regression
framework.

PTAL
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