DWARFUnit: kill dead code and make a couple of functions private. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193780 91177308-0d34-0410-b5e6-96231b3b80d8
[mips] XFAIL several MCJIT remote tests

Two of the tests are new test cases (cross-module-a.ll, multi-module-a.ll)
not yet supported on MIPS, while XFAIL for the other two tests was
accidentally removed in r193570 and this change reverts those lines.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193781 91177308-0d34-0410-b5e6-96231b3b80d8
Add FileCheck tests for @LINE

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193782 91177308-0d34-0410-b5e6-96231b3b80d8
DWARFDebugArangeSet: remove dead code

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193785 91177308-0d34-0410-b5e6-96231b3b80d8