[DAG][ARM][AArch64] Transform max(a,b) - min(a,b) -> abd(a,b)

This adds both signed and unsigned transforms for
max(a, b) - min(a, b) -> abd(a, b).

unsigned: https://alive2.llvm.org/ce/z/RF4jGQ
signed: https://alive2.llvm.org/ce/z/Cjr2zE

Fixes: #59894

Differential Revision: https://reviews.llvm.org/D141706