[PATCH] [libcxx] Initializer list support for MSVC

[Agustín Bergé]

>>! In D5127#4, @mclow.lists wrote:
> Do we need tests for this change?

The existing tests will do fine, the problem is that the test wont just run with libc++ as is. I had to make a number of changes and add workarounds to get it to work with MSVC, as well as hacked lit.cfg to just work. I'm not sure how to proceed with these changes.

http://reviews.llvm.org/D5127