Fix the output of llvm-nm for Mach-O files to use the characters ‘d’ and ‘b’ for
data and bss symbols instead of the generic ’s’ for a symbol in a section.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211321 91177308-0d34-0410-b5e6-96231b3b80d8