[PATCH] D48134: [CodeGen] make nan builtins pure rather than const (PR37778)

[Roman Lebedev via Phabricator via cfe-commits]

lebedev.ri added a comment.

In https://reviews.llvm.org/D48134#1131626, @rsmith wrote:

> Can we mark these as `argmemonly`?


Header comment in `include/clang/Basic/Builtins.def` does not list that as a possibility.


Repository:
  rL LLVM

https://reviews.llvm.org/D48134