CodeGen: Add a dwo output file argument to addPassesToEmitFile and hook it up to dwo output.

Part of PR37466.

Differential Revision: https://reviews.llvm.org/D47089

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@332881 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed