r267249 removed the dual ARM/Thumb interface from MachOObjectFile,
simplifying llvm-dsymutil's code. This unfortunately also regressed
llvm-dsymutil's ability to select thumb slices, because the simplified
code was also dealing with the discrepency between the slice arch
(eg. armv7m) and the triple arch name (eg. thumbv7m).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268894 91177308-0d34-0410-b5e6-96231b3b80d8