Don't require a space between the two ">" in "vector<id<protocol>>" in objc++11.

C++11 allowed writing "vector<vector<int>>" without a space between the two ">".
This change allows this for protocols in template lists too in -std=c++11 mode,
and improves the diagnostic in c++98 mode.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170223 91177308-0d34-0410-b5e6-96231b3b80d8