CodeGen: Default overflow operations to expand so we don't have to assume targets are lying

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: ab
Differential Revision: http://reviews.llvm.org/D9265

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236119 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed