Add detailed diagnostics to LoopUnroll pass

[Michael Zolotukhin]

Hi,

This patch adds some diagnostics to loop-unroll pass, triggered by -Rpass-analysis=loop-unroll and -Rpass-missed=loop-unroll. Currently we only do -Rpass=loop-unroll diagnostics in this pass.

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The patch shouldn't change any logic in the pass work, only rearrange code a bit and add the reports. Is it ok to commit?

Thanks,
Michael