[PATCH] [lld] [mach-o] implement minimal __unwind_info support

[Rui Ueyama]

Could you run clang-format on the new code?

================
Comment at: lib/ReaderWriter/MachO/CompactUnwindPass.cpp:10
@@ +9,3 @@
+///
+/// \file
+///
----------------
Needs a brief description about what this file is for.

http://reviews.llvm.org/D5261