ARM: fix optimised division on WoA

We did not have an explicit branch to the continuation BB.  When the check was
hoisted, this could permit control follow to fall through into the division
trap.  Add the explicit branch to the continuation basic block to ensure that
code execution is correct.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264370 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed