[libcxxabi] Set up .arcconfig to point to new Diffusion CXXA repository

Authored by benhamilton on Dec 4 2017, 3:14 PM.


[libcxxabi] Set up .arcconfig to point to new Diffusion CXXA repository

We want to automatically copy the appropriate mailing list
for review requests to the libc++abi repository.

For context, see the proposal and discussion here:


Similar to D40500, I set up a new Diffusion repository with callsign
"CXXA" for libc++abi:


This explicitly updates libcxxabi's .arcconfig to point to the new
CXX repository in Diffusion, which will let us use Herald rule H268.

Reviewers: phosek, beanz, EricWF, compnerd

Reviewed By: phosek

Subscribers: cfe-commits, klimek, sammccall, dlj, bkramer

Differential Revision: https://reviews.llvm.org/D40501

llvm-svn: 319713