Final bit of P0063 - make sure that aligned_alloc is available when the underlying C library supports it

llvm-svn: 338457
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 1f9e03f04d4fd0f9c76bded4ad0e43fc80e480fa
3 files changed