[Bug target/118622] vshrn_n_u16 with a vmvnq_u16 should produce the same code as a vsubhn_u16 with -1

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118622

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 60246
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60246&action=edit
testcase

In comment #0, I forgot the add in the include files so I am attaching the full
testcase here.