Use isOSBinFormatMachO() instead of comparing the object format
against an enum.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223422 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer] Eliminated endless loop.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223426 91177308-0d34-0410-b5e6-96231b3b80d8