Work around a standard defect: template argument deduction for non-type

template parameters of reference type basically doesn't work, because we're
always deducing from an argument expression of non-reference type, so the type
of the deduced expression never matches. Instead, compare the type of an
expression naming the parameter to the type of the argument.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@290586 91177308-0d34-0410-b5e6-96231b3b80d8