[llvm] r259675 - Revert r259662, which caused regressions on polly tests.

[Daniel Berlin via llvm-commits]

>
>
> In SCEVExpander::expand, there is a logic to check the cached value to
> be used should dominate the insertion point. However, for the above
> case, the check always passes. That is because the insertion point is
> in a new function, which is unreachable from the old function. However
> for unreachable node, DominatorTreeBase::dominates thinks it will be
> dominated by any other node.
>

Sigh. Just about 6 months ago, we went through a discussion on this mailing
list where i pointed out this behavior by dominates was bad, and the
general consensus was "hey, how often is it really going to cause a
problem" vs "simplify life".

Chalk one up to the former column.
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