Diagnose more cases of initializing distinct members of an anonymous union
member.  Use a better diagnostic for this case.  Also fix a bug with nested
anonymous structs/unions for -Wreorder;  this last was PR6575.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@100923 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed