tree-optimization/110563 - simplify epilogue VF checks

tree-optimization/110563 - simplify epilogue VF checks

The following consolidates an assert that now hits for ppc64le
with an earlier check we already do, simplifying
vect_determine_partial_vectors_and_peeling and getting rid of
its now redundant argument.

	PR tree-optimization/110563
	* tree-vectorizer.h (vect_determine_partial_vectors_and_peeling):
	Remove second argument.
	* tree-vect-loop.cc (vect_determine_partial_vectors_and_peeling):
	Remove for_epilogue_p argument.  Merge assert ...
	(vect_analyze_loop_2): ... with check done before determining
	partial vectors by moving it after.
	* tree-vect-loop-manip.cc (vect_do_peeling): Adjust.