add some infrastructure that will let us codegen
http://llvm.org/bugs/show_bug.cgi?id=279#c3 better.

No functionality change yet.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120530 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed