Add a flag to the IRPrinter instrumentation to only print after a pass if...

Add a flag to the IRPrinter instrumentation to only print after a pass if there is a change to the IR.

This adds an additional filtering mode for printing after a pass that checks to see if the pass actually changed the IR before printing it. This "change" detection is implemented using a SHA1 hash of the current operation and its children.

PiperOrigin-RevId: 284291089