Reland [AArch64] Fix an immediate out of range for large realignments on Windows

Also add a missing FrameSetup flag on the existing add instruction.

This fixes https://github.com/llvm/llvm-project/issues/63701.

Since the previous iteration, change ADDXrr to ADDXrx64, which
works with this use of SP.

Differential Revision: https://reviews.llvm.org/D155447