[committed] amdgcn: Silence unused parameter warning

[Andrew Stubbs]

A function parameter was left over from a previous draft of my 
multiple-vector-length patch. This patch silences the harmless warning.

Andrewamdgcn: Silence unused parameter warning
gcc/ChangeLog:

        * config/gcn/gcn.cc (gcn_simd_clone_compute_vecsize_and_simdlen):
        Set base_type as ARG_UNUSED.

diff --git a/gcc/config/gcn/gcn.cc b/gcc/config/gcn/gcn.cc
index a9ef5c3dc02..a561976d7f5 100644
--- a/gcc/config/gcn/gcn.cc
+++ b/gcc/config/gcn/gcn.cc
@@ -5026,7 +5026,7 @@ gcn_vectorization_cost (enum vect_cost_for_stmt 
ARG_UNUSED (type_of_cost),
 static int
 gcn_simd_clone_compute_vecsize_and_simdlen (struct cgraph_node *ARG_UNUSED 
(node),
                                            struct cgraph_simd_clone *clonei,
-                                           tree base_type,
+                                           tree ARG_UNUSED (base_type),
                                            int ARG_UNUSED (num))
 {
   if (known_eq (clonei->simdlen, 0U))