Patch from Keno Fischer to enable JITLoaderGDB with mach-o file support.

The patch is as is with the functionality left disabled for apple vendors because of performance regressions. If this is enabled it ends up searching for symbols in all shared libraries that are loadeded.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@211638 91177308-0d34-0410-b5e6-96231b3b80d8