ARM: support .watchos_version_min and .tvos_version_min.

These MachO file directives are used by linkers and other tools to provide
compatibility information, much like the existing .ios_version_min and
.macosx_version_min.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251569 91177308-0d34-0410-b5e6-96231b3b80d8
19 files changed