Rename PLACEHOLDER code kind to WASM_FUNCTION.

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index 0209f95b85269ee90d4ec7f25f33a5415802b4cf..00a4fe8f4b5ad80bf0e51a69b68a7b8e5dc31e0c 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -1645,8 +1645,8 @@ void Logger::LogCodeObject(Object* object) {
       description = "A keyed store IC from the snapshot";
       tag = Logger::KEYED_STORE_IC_TAG;
       break;
-    case Code::PLACEHOLDER:
-      description = "A placeholder for linking later code";
+    case Code::WASM_FUNCTION:
+      description = "A wasm function";
       tag = Logger::STUB_TAG;
       break;
     case Code::NUMBER_OF_KINDS: