[libcxx] r284214 - XFAIL aligned allocation tests for older Clang versions

[Tim Northover via cfe-commits]

On 14 October 2016 at 14:21, Eric Fiselier via cfe-commits
<cfe-commits at lists.llvm.org> wrote:
> Could you give me more information about the compiler your using?

Do you mostly build libcxx outside of a Clang source tree? I suspect
the problem is that if Clang is built at the same time then that's the
Clang which gets used to test libcxx, so it's effectively always 4.0.

This is consistent with local tests I've run of both in-tree builds
and out (using Xcode 8).

Cheers.

Tim.