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[Polly] [PPCGCodeGeneration] Mild refactoring of checking validity of functions…

Description

[Polly] [PPCGCodeGeneration] Mild refactoring of checking validity of functions in a kernel.

This is a stylistic change to make the function a little more readable.
Also add a debug print to show what instruction contains a use of a
function we don't understand in the kernel.

Differential Revision: https://reviews.llvm.org/D37058