[libcxx-commits] [libcxx] [libcxx] Fix include directory order (PR #65859)

[Alex Brachet via libcxx-commits]

abrachet wrote:

> Can you add this part "It's important that the arch directory be included first so that its header files which interpose on the default include dir be included instead of the default ones."
> 
> as comment in the code too?

Done

https://github.com/llvm/llvm-project/pull/65859