[wasm] Attach loop assignment analysis behind a flag.

src/compiler/wasm-compiler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/wasm-compiler.h"
 
 #include "src/isolate-inl.h"
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/base/platform/platform.h"
@@ skipping 2479 matching lines @@
   if (!code.is_null()) {
     RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, "WASM_function",
                               function.func_index,
                               module_env->module->GetName(
                                   function.name_offset, function.name_length));
   }
 
   if (FLAG_trace_wasm_decode_time) {
     double compile_ms = compile_timer.Elapsed().InMillisecondsF();
     PrintF(
-        "wasm-compile ok: %d bytes, %0.3f ms decode, %0.3f ms compile\n",
+        "wasm-compile ok: %d bytes, %0.3f ms decode, %d nodes, %0.3f ms "
+        "compile\n",
         static_cast<int>(function.code_end_offset - function.code_start_offset),
-        decode_ms, compile_ms);
+        decode_ms, static_cast<int>(graph.NodeCount()), compile_ms);
   }
   return code;
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8