[wasm] Remove redundant buffer fill

This loop is redundant in {GetNodes}.

R=titzer@chromium.org

Bug: v8:8423
Change-Id: Ia624fbe145ae2cd77ea099c3f109899ea6fac9c0
Reviewed-on: https://chromium-review.googlesource.com/c/1370031Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58131}

src/wasm/graph-builder-interface.cc

@@ -248,12 +248,8 @@ class WasmGraphBuildingInterface {
       DCHECK_EQ(1, decoder->control_depth());
       SetEnv(decoder->control_at(0)->end_env);
     }
-    size_t num_values = values.size();
-    TFNode** buffer = GetNodes(values);
-    for (size_t i = 0; i < num_values; ++i) {
-      buffer[i] = values[i].node;
-    }
-    BUILD(Return, static_cast<uint32_t>(values.size()), buffer);
+    TFNode** nodes = GetNodes(values);
+    BUILD(Return, static_cast<uint32_t>(values.size()), nodes);
   }
 
   void GetLocal(FullDecoder* decoder, Value* result,