[PATCH] D45476: [C++2a] Implement operator<=> CodeGen and ExprConstant

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added a comment.

This is significantly more complexity than we need. We're talking about constexpr variables here, so we just need a `VarDecl* -- you can then ask that declaration for its evaluated value and emit that directly.


https://reviews.llvm.org/D45476