Removed unused function argument. NFC.

Differential Revision: https://reviews.llvm.org/D25839

llvm-svn: 284843
diff --git a/clang/lib/Sema/SemaCUDA.cpp b/clang/lib/Sema/SemaCUDA.cpp
index 7e05cc8..c578f92 100644
--- a/clang/lib/Sema/SemaCUDA.cpp
+++ b/clang/lib/Sema/SemaCUDA.cpp
@@ -439,7 +439,7 @@
 // ForceCUDAHostDeviceDepth > 0 (corresponding to code within a
 //   #pragma clang force_cuda_host_device_begin/end
 // pair).
-void Sema::maybeAddCUDAHostDeviceAttrs(Scope *S, FunctionDecl *NewD,
+void Sema::maybeAddCUDAHostDeviceAttrs(FunctionDecl *NewD,
                                        const LookupResult &Previous) {
   assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");