[CMake] Add atomic builtins to GENERIC_SOURCES list.
[CMake] Add atomic builtins to GENERIC_SOURCES list.

Reviewers: bogner, samsonov

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13069

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@248322 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt