[AArch64] Combine SELECT_CC patterns that match smin(a,0) and smax(a,0)

With a previous patch to canonicalize SPF to min/max intrinsics (a266af72),
we saw a performance regression on the AArch64 backend.

This patch recovers from the SPF canonicalization by combining smin(a,0) and
smax(a,0) SELECT_CC patterns during AArch64ISelLowering.

GitHub Issue: #61767

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D148249