tree dc14f24898f6a77f321908fd82b0d1486a77b632
parent c47bdd41f5e31860bfed44a3b21997199b0be5e9
author Louis Dionne <ldionne@apple.com> 1605196934 -0500
committer Copybara-Service <copybara-worker@google.com> 1605326359 -0800

[libc++] Only check for GCC's empty string storage on macOS and iOS

We don't need to do that on other Apple platforms, since they never
shipped libstdc++. I also added a comment extracted from the original
commit by Howard Hinnant (e115af2777f6).

Differential Revision: https://reviews.llvm.org/D91359

GitOrigin-RevId: 2728293bbc345a7c80fcd5ee0cc2ac3eac582bc8