Silence unused argument warning for --cuda-host-only.

Differential Revision: http://reviews.llvm.org/D11575

llvm-svn: 243479
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 86cf855..a39f7fc 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1490,6 +1490,10 @@
 
   // Claim ignored clang-cl options.
   Args.ClaimAllArgs(options::OPT_cl_ignored_Group);
+
+  // Claim --cuda-host-only arg which may be passed to non-CUDA
+  // compilations and should not trigger warnings there.
+  Args.ClaimAllArgs(options::OPT_cuda_host_only);
 }
 
 std::unique_ptr<Action>