[Bug target/98697] shl not vectorized for v16qi and v8hi with MVE

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98697

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
it looks like unpack from short int to int is not supported?  That is,
the usual issue is that a[i] << b[i] is a shift of int << ... because
of C integral promotion rules.