[xray] Add XRay support for Mach-O in CodeGen

Currently, XRay only supports emitting the XRay table (xray_instr_map) on ELF binaries. Let's add Mach-O support.

Differential Revision: https://reviews.llvm.org/D26983



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287734 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed