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

[Sean Silva]

In http://reviews.llvm.org/D8508#144677, @probinson wrote:

> 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.)


The real solution is to not have to walk the list for every method call like this. I.e. use a data structure that efficiently supports these sorts of queries.


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http://reviews.llvm.org/D8508

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