When creating an implicit conversion sequence for a reference of type T from an
initializer list containing a single element of type T, be sure to mark the
sequence as a list conversion sequence so that it is known to be worse than an
implicit conversion sequence that initializes a std::initializer_list object.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190115 91177308-0d34-0410-b5e6-96231b3b80d8