[Polly] Use llvm::function_ref. NFC.
As suggested by David Blaike at https://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20200824/822584.html
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As suggested by David Blaike at https://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20200824/822584.html