Make sure to perform dependent access checks when instantiating a

lambda-expression. We don't actually instantiate the closure type / operator()
in the template in order to produce the closure type / operator() in the
instantiation, so this isn't caught by the normal path.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@264184 91177308-0d34-0410-b5e6-96231b3b80d8