Don't allow calls to functions marked "unavailable". There's more work
to do in this area, since there are other places that reference
FunctionDecls.

Don't allow "overloadable" functions (in C) to be declared without a
prototype.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64897 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed