[Bug target/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87064

--- Comment #23 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45496
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45496&action=edit
gcc9-pr87064.patch

Patch I've so far tested on powerpc64le-linux only, where it fixed
FAIL: libgomp.oacc-fortran/reduction-3.f90 -DACC_DEVICE_TYPE_host=1
-DACC_MEM_SHARED=1  -O1  execution test
and didn't regress anything else.  I can bootstrap/regtest even on
powerpc64-linux (though I believe it is pointless, given that I know from the
earlier statistics gathering that the pattern is never used on powerpc64-linux
during bootstrap nor -m32/-m64 regtest).
So, I'll post to gcc-patches.  The v4sf_scalar I'll leave to you, ok?