This clean-up improves consistency within i386.md by using QImode for
the constant shift count in patterns that specify a mode.

This patch has been tested on x86_64-pc-linux-gnu with make bootstrap
and make -k check, both with and without --target_board=unix{-m32}
with no new failures.  Ok for mainline?


2023-06-18  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
        * config/i386/i386.md (*concat<mode><dwi>3_1): Use QImode
        for the immediate constant shift count.
        (*concat<mode><dwi>3_2): Likewise.
        (*concat<mode><dwi>3_3): Likewise.
        (*concat<mode><dwi>3_4): Likewise.
        (*concat<mode><dwi>3_5): Likewise.
        (*concat<mode><dwi>3_6): Likewise.


Thanks,
Roger
--