This is just an oversight because we already do recognize __builtin_remquo()
with the same signature.

http://en.cppreference.com/w/c/numeric/math/remquo
http://pubs.opengroup.org/onlinepubs/9699919799/functions/remquo.html

Differential Revision: https://reviews.llvm.org/D39615


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317407 91177308-0d34-0410-b5e6-96231b3b80d8