re PR tree-optimization/83323 (186.crafty miscompares)

re PR tree-optimization/83323 (186.crafty miscompares)

Fix PR83323

	* gimple-loop-jam (unroll_jam_possible_p): Correct test for
	head-controlled loops and loop BBs.
	* common.opt (funroll-and-jam): Remove, instead ...
	(floop-unroll-and-jam): ... reuse this option.
	* opts.c (default_options_table): Use OPT_floop_unroll_and_jam.
	* doc/invoke.texi (-funroll-and-jam): Move docu to ...
	(-floop-unroll-and-jam): ... this option.

testsuite/
	* gcc.dg/pr83323.c: New test.
	* gcc.dg/unroll-and-jam.c: Use -floop-unroll-and-jam.

From-SVN: r255514