[PATCH] Make getLastArgNoClaim work for up to 4 arguments.

[Paul Robinson]

In http://reviews.llvm.org/D8508#144526, @Bigcheese wrote:

> Why not make this a variadic template?


A variadic "matches" method on Option would keep it from being 
amazingly inefficient. (i.e. don't iterate through ArgList N times.)


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http://reviews.llvm.org/D8508

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