[Bug middle-end/32911] Function __attribute__ ((idempotent))

[bugzilla at tecnocode dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32911

--- Comment #5 from Philip Withnall <bugzilla at tecnocode dot co.uk> ---
Bug filed against Clang with the same request here:
https://bugs.llvm.org/show_bug.cgi?id=34600