[DebugInfo] Make legal and emit DW_OP_swap and DW_OP_xderef

Differential Revision: https://reviews.llvm.org/D29672


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297247 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed