[polly] Add polly-debug flag to print debug info from all parts of polly (#78549)

This flag enable the user to print debug Info from all the passes and
helpers inside polly at once. This will help a novice user as well to
work in polly without explicitly having to know which parts of polly has
actually kicked in and pass them via -debug-only.

GitOrigin-RevId: 601d7eab0665ba298d81952da11593124fd893a0
24 files changed