[Bug target/58017] [SH] Use shift and test for unsigned compare

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58017

--- Comment #1 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #0)
> 
> especially if the compared reg is dead after the comparison.

... and the constant is not shared with any other insn
    and the comparison is not in a (tight) loop.

if such comparisons are found in loops, the constant load should be hoisted.