[r11-3723 Regression] FAIL: gcc.dg/vect/bb-slp-subgroups-3.c scan-tree-dump-times slp2 "optimized: basic block" 2 on Linux/x86_64

[sunil.k.pandey]

On Linux/x86_64,

532e882f8872b1b4437e3a0fa8c61d2af2d999d4 is the first bad commit
commit 532e882f8872b1b4437e3a0fa8c61d2af2d999d4
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Oct 8 11:53:51 2020 +0200

    adjust BB vectorization dump scanning

caused

FAIL: gcc.dg/vect/bb-slp-pr78205.c -flto -ffat-lto-objects  scan-tree-dump-times slp2 "optimized: basic block" 3
FAIL: gcc.dg/vect/bb-slp-pr78205.c scan-tree-dump-times slp2 "optimized: basic block" 3
FAIL: gcc.dg/vect/bb-slp-subgroups-3.c -flto -ffat-lto-objects  scan-tree-dump-times slp2 "optimized: basic block" 2
FAIL: gcc.dg/vect/bb-slp-subgroups-3.c scan-tree-dump-times slp2 "optimized: basic block" 2

with GCC configured with

Configured with: ../../gcc/configure --prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-3723/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-pr78205.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-pr78205.c --target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-subgroups-3.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-subgroups-3.c --target_board='unix{-m64\ -march=cascadelake}'"

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