Implement explicit specialization of explicitly-defaulted constructors.
The general out-of-line case (including explicit instantiation mostly
works except that the definition is being lost somewhere between the AST
and CodeGen, so the definition is never emitted.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131933 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed