[wasm] Clean up handling of function names.

test/cctest/wasm/wasm-run-utils.h

 // Copyright 2016 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.
 
 #ifndef WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 146 matching lines @@
     rng.SetSeed(seed);
     rng.NextBytes(raw, end - raw);
   }
 
   WasmFunction* AddFunction(FunctionSig* sig, Handle<Code> code) {
     AllocModule();
     if (module->functions == nullptr) {
       module->functions = new std::vector<WasmFunction>();
       instance->function_code = new std::vector<Handle<Code>>();
     }
-    module->functions->push_back({sig, 0, 0, 0, 0, 0, 0, 0, false, false});
+    uint32_t index = static_cast<uint32_t>(module->functions->size());
+    module->functions->push_back(
+        {sig, index, 0, 0, 0, 0, 0, 0, 0, false, false});
     instance->function_code->push_back(code);
     return &module->functions->back();
   }
 
   void AddIndirectFunctionTable(int* functions, int table_size) {
     AllocModule();
     Isolate* isolate = module->shared_isolate;
     Handle<FixedArray> fixed =
         isolate->factory()->NewFixedArray(2 * table_size);
     instance->function_table = fixed;
@@ skipping 231 matching lines @@
     if (p1 == MachineType::None()) return 1;
     if (p2 == MachineType::None()) return 2;
     if (p3 == MachineType::None()) return 3;
     return 4;
   }
 };
 
 }  // namespace
 
 #endif