[PATCH] D50739: Clean up macros to detect underling C library functionality

[Louis Dionne via Phabricator via cfe-commits]

ldionne requested changes to this revision.
ldionne added a comment.
This revision now requires changes to proceed.

Marking as "request changes" to get off my review queue until the problem I pointed w.r.t. `TEST_HAS_C11_FEATURES` and `_LIBCPP_HAS_C11_FEATURES` always being undefined is resolved.


https://reviews.llvm.org/D50739