Major anonymous union/struct redesign.
A new AST node is introduced:
   def IndirectField : DDecl<Value>;
IndirectFields are injected into the anonymous's parent scope and chain back to
the original field. Name lookup for anonymous entities now result in an
IndirectFieldDecl instead of a FieldDecl.
There is no functionality change, the code generated should be the same.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119919 91177308-0d34-0410-b5e6-96231b3b80d8
17 files changed