Extend the new 'availability' attribute with support for an
'unavailable' argument, which specifies that the declaration to which
the attribute appertains is unavailable on that platform.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128329 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed