[ASTPrinter] Print nested name specifiers for out-of-line functions

rdar://31501863

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@299962 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 506a43a28e16fd08b23f2ee57c3ef0debba27042)
5 files changed