Add atomic_inc and atomic_add builtins

Reviewed-by: Aaron Watry <awatry@gmail.com>

git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@190058 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unneeded semi-colons

Reviewed-By: Aaron Watry <awatry@gmail.com>

git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@190059 91177308-0d34-0410-b5e6-96231b3b80d8