Fix inaccuracy in cunroll/cunrolli when considering what's innermost loop.

Fix inaccuracy in cunroll/cunrolli when considering what's innermost loop.

r15-919-gef27b91b62c3aa removed 1 / 3 size reduction for innermost
loop, but it doesn't accurately remember what's "innermost" for 2
testcases in PR117888.

1) For pass_cunroll, the "innermost" loop could be an originally outer
loop with inner loop completely unrolled by cunrolli. The patch moves
local variable cunrolli to parameter of tree_unroll_loops_completely
and passes it directly from execute of the pass.

2) For pass_cunrolli, cunrolli is set to false when the sibling loop
of a innermost loop is completely unrolled, and it inaccurately
takes the innermost loop as an "outer" loop. The patch add another
paramter innermost to helps recognizing the "original" innermost loop.

gcc/ChangeLog:

	PR tree-optimization/117888
	* tree-ssa-loop-ivcanon.cc (try_unroll_loop_completely): Use
	cunrolli instead of cunrolli && !loop->inner to check if it's
	innermost loop.
	(canonicalize_loop_induction_variables): Add new parameter
	const_sbitmap innermost, and pass
	cunrolli
	&& (unsigned) loop->num < SBITMAP_SIZE (innermost)
	&& bitmap_bit_p (innermost, loop->num) as "cunrolli" to
	try_unroll_loop_completely
	(canonicalize_induction_variables): Pass innermost to
	canonicalize_loop_induction_variables.
	(tree_unroll_loops_completely_1): Add new parameter
	const_sbitmap innermost.
	(tree_unroll_loops_completely): Move local variable cunrolli
	to parameter to indicate it's from pass cunrolli, also track
	all "original" innermost loop at the beginning.

gcc/testsuite/ChangeLog:

	* gcc.dg/pr117888-2.c: New test.
	* gcc.dg/vect/pr117888-1.c: Ditto.
	* gcc.dg/tree-ssa/pr83403-1.c: Add
	--param	max-completely-peeled-insns=300 for arm*-*-*.
	* gcc.dg/tree-ssa/pr83403-2.c: Ditto.