[PATCH] Add RelocVisitor support for MachO

[Keno Fischer]

Hi lhames, friss,

This splits out the non ExecutionEngine/MCJIT changes out of http://reviews.llvm.org/D6961 in order to hopefully allow easier review. In particular, this commit set adds partial support for MachO relocations to RelocVisitor, as well as adding a test case where this is applied. It also fixes a bug in the line info handling in the dwarf code slightly, based on a problem I saw with the test case. Since addr+size will give the first address past the end of the function, we need to back up one line table entry. However, if we are doing the comparison with < rather than <=, we actually end up with the second entry past the end of the current function, if the next function starts at exactly addr+size (the first entry for the next function is at addr+size, so the next entry greater than it is the second entry for the next function). This comes up on MachO much more than on ELF, since MachO doesn't store the symbol size separately, hence making said situation always occur.

I hope I also addressed all the review comments pertinent to these changes from the old review.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8148

Files:
  include/llvm/DebugInfo/DWARF/DWARFDebugLine.h
  include/llvm/Object/MachO.h
  include/llvm/Object/RelocVisitor.h
  lib/DebugInfo/DWARF/DWARFDebugLine.cpp
  lib/Object/MachOObjectFile.cpp
  test/DebugInfo/Inputs/test-multiple-macho.o
  test/DebugInfo/Inputs/test-simple-macho.o
  test/DebugInfo/debuglineinfo-macho.test
  tools/llvm-rtdyld/llvm-rtdyld.cpp

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