[wasm] Use the official opcode names everywhere.

test/unittests/wasm/wasm-opcodes-unittest.cc

+// Copyright 2017 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 "test/unittests/test-utils.h"
+
+#include "src/wasm/wasm-opcodes.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+
+class WasmOpcodesTest : public TestWithZone {};
+
+TEST_F(WasmOpcodesTest, EveryOpcodeHasAName) {
+  static const struct {
+    WasmOpcode opcode;
+    const char* debug_name;
+  } kValues[] = {
+#define DECLARE_ELEMENT(name, opcode, sig) {kExpr##name, "kExpr" #name},
+      FOREACH_OPCODE(DECLARE_ELEMENT)};
+
+  for (size_t i = 0; i < arraysize(kValues); i++) {
+    const char* result = WasmOpcodes::OpcodeName(kValues[i].opcode);
+    if (strcmp("unknown", result) == 0) {
+      EXPECT_TRUE(false) << "WasmOpcodes::OpcodeName(" << kValues[i].debug_name
+                         << ") == \"unknown\";"
+                            " plazz halp in src/wasm/wasm-opcodes.cc";
+    }
+  }
+}
+}  // namespace wasm
+}  // namespace internal
+}  // namespace v8