Fix a broken typedef; NFCI

Richard Smith noted that `typedef typename iplist::iplist_impl_type
iplist_impl_type` is incorrect, per
http://eel.is/c++draft/basic.scope#class-2

It seems that neither clang nor gcc get too angry about this, but a
newer version of msvc does.

Thanks to jcmac on IRC for pointing this out!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330639 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed