Cleanup MachO writer and code emitter. Fix 80 cols problems, remove extra spaces, shrink down includes and move some methods out-of-line

llvm-svn: 74817

cleanup, removed some #includes and moved Object Code Emitter out-of-line.

llvm-svn: 74813

one new .cpp file, in preparation for merging in the Direct Object Emission
changes we're working on. No functional changes.
Fixed coding style issues on the original patch. Patch by Aaron Gray

llvm-svn: 72754