Fix mac build.

Change-Id: I228cdb0b25cd0f2c5e745a87a97aa8fd3c8a160a
diff --git a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
index cccf8f3..a6b5ffd 100644
--- a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
@@ -227,8 +227,8 @@
 }
 
 void ResetQuickAllocEntryPoints(QuickEntryPoints* qpoints) {
-  switch (entry_points_allocator) {
 #if !defined(__APPLE__) || !defined(__LP64__)
+  switch (entry_points_allocator) {
     case gc::kAllocatorTypeDlMalloc: {
       SetQuickAllocEntryPoints_dlmalloc(qpoints, entry_points_instrumented);
       break;
@@ -247,12 +247,14 @@
       SetQuickAllocEntryPoints_tlab(qpoints, entry_points_instrumented);
       break;
     }
-#endif
-    default: {
-      UNIMPLEMENTED(FATAL);
-      UNREACHABLE();
-    }
+    default:
+      break;
   }
+#else
+  UNUSED(qpoints);
+#endif
+  UNIMPLEMENTED(FATAL);
+  UNREACHABLE();
 }
 
 }  // namespace art