Implement support for C++ nested-name-specifiers ('foo::bar::x') in the Parser side.
No Sema functionality change, just the signatures of the Action/Sema methods.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58913 91177308-0d34-0410-b5e6-96231b3b80d8
17 files changed