adjust BB vectorization dump scanning

adjust BB vectorization dump scanning

This adjusts BB vectorization testcases to look for the number of
SLP subgraphs vectorized rather than for the number of basic blocks
we've found opportunities in because followup patches will play
with the granularity we work on, vectorizing multiple basic blocks
at a time.

Together with this, because I noticed when looking at non-obvious
mismatches, I avoid analyzing group-size 1 SLP instances which
result in pointless V1mode vectorizations.

It might be interesting to work on adding sth like
dg-warning to look for -fopt-info-{optimized,missing} so
we could directly annotate (not) vectorized loops instead of
relying on fragile counts.

2020-10-08  Richard Biener  <rguenther@suse.de>

	* tree-vectorizer.c (try_vectorize_loop_1): Do not dump
	"basic block vectorized".
	(pass_slp_vectorize::execute): Likewise.
	* tree-vect-slp.c (vect_analyze_slp_instance): Avoid
	re-analyzing split single stmts.

	* g++.dg/vect/slp-pr50819.cc: Adjust.
	* gcc.dg/vect/bb-slp-1.c: Adjust.
	* gcc.dg/vect/bb-slp-10.c: Adjust.
	* gcc.dg/vect/bb-slp-11.c: Adjust.
	* gcc.dg/vect/bb-slp-13.c: Adjust.
	* gcc.dg/vect/bb-slp-14.c: Adjust.
	* gcc.dg/vect/bb-slp-15.c: Adjust.
	* gcc.dg/vect/bb-slp-16.c: Adjust.
	* gcc.dg/vect/bb-slp-17.c: Adjust.
	* gcc.dg/vect/bb-slp-18.c: Adjust.
	* gcc.dg/vect/bb-slp-19.c: Adjust.
	* gcc.dg/vect/bb-slp-2.c: Adjust.
	* gcc.dg/vect/bb-slp-20.c: Adjust.
	* gcc.dg/vect/bb-slp-21.c: Adjust.
	* gcc.dg/vect/bb-slp-22.c: Adjust.
	* gcc.dg/vect/bb-slp-23.c: Adjust.
	* gcc.dg/vect/bb-slp-24.c: Adjust.
	* gcc.dg/vect/bb-slp-25.c: Adjust.
	* gcc.dg/vect/bb-slp-26.c: Adjust.
	* gcc.dg/vect/bb-slp-27.c: Adjust.
	* gcc.dg/vect/bb-slp-28.c: Adjust.
	* gcc.dg/vect/bb-slp-29.c: Adjust.
	* gcc.dg/vect/bb-slp-3.c: Adjust.
	* gcc.dg/vect/bb-slp-30.c: Adjust.
	* gcc.dg/vect/bb-slp-31.c: Adjust.
	* gcc.dg/vect/bb-slp-34.c: Adjust.
	* gcc.dg/vect/bb-slp-35.c: Adjust.
	* gcc.dg/vect/bb-slp-36.c: Adjust.
	* gcc.dg/vect/bb-slp-38.c: Adjust.
	* gcc.dg/vect/bb-slp-4.c: Adjust.
	* gcc.dg/vect/bb-slp-45.c: Adjust.
	* gcc.dg/vect/bb-slp-46.c: Adjust.
	* gcc.dg/vect/bb-slp-48.c: Adjust.
	* gcc.dg/vect/bb-slp-5.c: Adjust.
	* gcc.dg/vect/bb-slp-6.c: Adjust.
	* gcc.dg/vect/bb-slp-7.c: Adjust.
	* gcc.dg/vect/bb-slp-8.c: Adjust.
	* gcc.dg/vect/bb-slp-8a.c: Adjust.
	* gcc.dg/vect/bb-slp-8b.c: Adjust.
	* gcc.dg/vect/bb-slp-9.c: Adjust.
	* gcc.dg/vect/bb-slp-div-2.c: Adjust.
	* gcc.dg/vect/bb-slp-over-widen-1.c: Adjust.
	* gcc.dg/vect/bb-slp-over-widen-2.c: Adjust.
	* gcc.dg/vect/bb-slp-pattern-2.c: Adjust.
	* gcc.dg/vect/bb-slp-pow-1.c: Adjust.
	* gcc.dg/vect/bb-slp-pr58135.c: Adjust.
	* gcc.dg/vect/bb-slp-pr65935.c: Adjust.
	* gcc.dg/vect/bb-slp-pr78205.c: Adjust.
	* gcc.dg/vect/bb-slp-pr81635-1.c: Adjust.
	* gcc.dg/vect/bb-slp-pr81635-3.c: Adjust.
	* gcc.dg/vect/bb-slp-pr95839-2.c: Adjust.
	* gcc.dg/vect/bb-slp-pr95839.c: Adjust.
	* gcc.dg/vect/bb-slp-pr95866.c: Adjust.
	* gcc.dg/vect/bb-slp-subgroups-1.c: Adjust.
	* gcc.dg/vect/bb-slp-subgroups-2.c: Adjust.
	* gcc.dg/vect/bb-slp-subgroups-3.c: Adjust.
	* gcc.dg/vect/fast-math-bb-slp-call-1.c: Adjust.
	* gcc.dg/vect/no-tree-reassoc-bb-slp-12.c: Adjust.
	* gcc.dg/vect/no-tree-sra-bb-slp-pr50730.c: Adjust.
	* gfortran.dg/vect/pr62283-2.f: Adjust.
	* gcc.target/i386/pr68961.c: Adjust.
	* gcc.target/i386/pr84101.c: Adjust.
	* gcc.dg/vect/bb-slp-pr81635-2.c: Adjust.
	* gcc.dg/vect/bb-slp-pr81635-4.c: Adjust.
	* gcc.dg/vect/fast-math-bb-slp-call-2.c: Adjust.
	* gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a.c: Adjust.
	* gcc.dg/vect/costmodel/x86_64/costmodel-vect-slp.c: Adjust.
	* gcc.dg/vect/bb-slp-div-1.c: Adjust.
	* gcc.dg/vect/bb-slp-pr90006.c: Adjust.
	* g++.dg/vect/slp-pr50413.cc: Adjust.