Pull in r217197 from upstream clang trunk (by Richard Smith):
PR20844: If we fail to list-initialize a reference, map to the referenced type before retrying the initialization to produce diagnostics. Otherwise, we may fail to produce any diagnostics, and silently produce invalid AST in a -Asserts build. Also add a note to this codepath to make it more clear why we were trying to create a temporary.
This should fix assertions when parsing some forms of incomplete list
intializers.
Direct commit to stable/9 and stable/10, since stable/11 and head
already have this upstream fix.
Reported by: ajcbowhill@gmail.com
PR: 202665