count() patch to unsigned for SmallPtrSet, SmallSet, SparseSet

[Alp Toker]

LGTM

On 21/12/2013 09:48, Yaron Keren wrote:
> The count() function for STL datatypes returns unsigned, even where 
> it's only 1/0 result like std::set. Some of the LLVM ADT already 
> return unsigned count(), while others still return bool count().
>
> This patch modifies SmallPtrSet, SmallSet, SparseSet :: count() to 
> return unsigned instead of bool, 1 instead of true and 0 instead of false.
>
> Yaron
>

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