-Wdocumentation should allow '...' params in variadic function type aliases

rdar://34811344

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@315103 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit c1458454c9b4c28723f31f50bbd97234cdee31de)
3 files changed