* analyze_brprob.py: Parse and display average number
of loop iterations.
* cfgloop.c (flow_loop_dump): Dump average number of loop iterations.
* cfgloop.h: Change 'struct loop' to 'const struct loop' for a
few functions.
* cfgloopanal.c (expected_loop_iterations_unbounded): Set a new
argument to true if the expected number of iterations is
loop-based.
From-SVN: r237762
