Fix formatting of overloaded operator definitions.

Before:
operatorvoid*();
operator vector< A< A>>();

After:
operator void *();
operator vector<A<A> >();

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174863 91177308-0d34-0410-b5e6-96231b3b80d8