[ARM] Add a div regression test for Cortex-M23

Summary:
This file was missed in the commit for Cortex-M23 and Cortex-M33
support.  See https://reviews.llvm.org/D29073?id=85814 .

Reviewers: rengolin, javed.absar, samparker

Reviewed By: samparker

Subscribers: llvm-commits, aemerson

Differential Revision: https://reviews.llvm.org/D30162

llvm-svn: 295655