Cleanup interface descriptors to reflect that vectors are part of loads.

test/cctest/compiler/function-tester.h

Index: test/cctest/compiler/function-tester.h
diff --git a/test/cctest/compiler/function-tester.h b/test/cctest/compiler/function-tester.h
index 20efd1e304ad26096d2c94c4daf3b57c186b0b50..81f7a05ef03379de42ffefcffa74cea424ad94a2 100644
--- a/test/cctest/compiler/function-tester.h
+++ b/test/cctest/compiler/function-tester.h
@@ -40,9 +40,11 @@ class FunctionTester : public InitializedHandleScope {
     CHECK_EQ(0u, flags_ & ~supported_flags);
   }
 
+  // TODO(turbofan): generalize FunctionTester to work with N arguments. Now, it
+  // can handle up to four.
   explicit FunctionTester(Graph* graph)
       : isolate(main_isolate()),
-        function(NewFunction("(function(a,b){})")),
+        function(NewFunction("(function(a,b,c,d){})")),
         flags_(0) {
     CompileGraph(graph);
   }
@@ -55,6 +57,12 @@ class FunctionTester : public InitializedHandleScope {
     return Execution::Call(isolate, function, undefined(), 2, args, false);
   }
 
+  MaybeHandle<Object> Call(Handle<Object> a, Handle<Object> b, Handle<Object> c,
+                           Handle<Object> d) {
+    Handle<Object> args[] = {a, b, c, d};
+    return Execution::Call(isolate, function, undefined(), 4, args, false);
+  }
+
   void CheckThrows(Handle<Object> a, Handle<Object> b) {
     TryCatch try_catch;
     MaybeHandle<Object> no_result = Call(a, b);