[Bug middle-end/78824] multiple add should in my opinion be optimized to multiplication

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78824

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Works for me on aarch64-linux-gnu with GCC 5.4 and above:
main:
        adrp    x1, nvx8
        adrp    x2, y
        mov     w0, 0
        ldrb    w1, [x1, #:lo12:nvx8]
        lsl     w1, w1, 4
        strh    w1, [x2, #:lo12:y]
        ret