Add ReportSizeChange Wrapper

Add a wrapper that reports the size of the in-memory IR representation
if the log level is info or greater.  This is intended to be used to
answer rough questions of "how much work is a specific transform
doing" or "how much is a transform throwing out of the circuit".

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>