Re-enable the int32 fast path for ShiftRightLogical, but account for
Maglev's missing signed/unsigned representation tracking by a)
removing rhs==0 as the identity value (a shift by 0 is still a
signed-unsigned conversion) and b) deoptimizing if the result cannot
be converted to a non-negative smi.

Note this is not a deopt loop, since a non-smi result will change the
feedback to kSignedSmallInputs (from kSignedSmall).

To fix this properly, we should track signed/unsigned representations
and convert the result to a heap number if it doesn't fit within smi
range.

Bug: v8:7700
Change-Id: Ifd538d227a6f1290eb7f008d9bfad586ff91ea0f
Fixed: v8:13251
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3876366Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83025}