[PATCH] ARM FastISel fix sext/zext fold

[JF Bastien]

> Did you mean:
>
> for (unsigned i = 0, e = array_lengthof(**FoldableExtends); i < e; ++i) {
>
> ? It's defined in ADT/STLExtras.h.
>

Indeed I did. My grepping failed to find this, but found a lot of code that
looked like what I wrote :-)
I'll use that when I check-in.
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