[PM] Remove four extraneous 'typename's that Clang (in C++11 mode) is
happy with but GCC complains about. I'm assuming both compilers are
correct and these are optional in C++11 because I'm too tired to read
the standard. ;]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195748 91177308-0d34-0410-b5e6-96231b3b80d8