Implement C++ DR 106 and C++ DR 540, both of which deal with
reference-collapsing. 

Implement diagnostic for formation of a reference to cv void.

Drop cv-qualifiers added to a reference type when the reference type
comes from a typedef.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58612 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed