[snapshot] include fewer strings.

R=mstarzinger@chromium.org

Change-Id: I6cb9d9b7b82ce05299bb6088b187e91c4fa2ca0f
Reviewed-on: https://chromium-review.googlesource.com/649750
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47911}

src/builtins/builtins-regexp-gen.cc

@@ -1704,7 +1704,7 @@ Node* RegExpBuiltinsAssembler::RegExpExec(Node* context, Node* regexp,
     GotoIf(WordEqual(result, NullConstant()), &out);
 
     ThrowIfNotJSReceiver(context, result,
-                         MessageTemplate::kInvalidRegExpExecResult, "unused");
+                         MessageTemplate::kInvalidRegExpExecResult, "");
 
     Goto(&out);
   }

src/heap/setup-heap-internal.cc

@@ -460,9 +460,7 @@ void Heap::CreateInitialObjects() {
     HandleScope scope(isolate());
 #define SYMBOL_INIT(name)                                              \
   {                                                                    \
-    Handle<String> name##d = factory->NewStringFromStaticChars(#name); \
     Handle<Symbol> symbol(isolate()->factory()->NewPrivateSymbol());   \
-    symbol->set_name(*name##d);                                        \
     roots_[k##name##RootIndex] = *symbol;                              \
   }
     PRIVATE_SYMBOL_LIST(SYMBOL_INIT)

src/snapshot/startup-serializer.cc

@@ -66,6 +66,12 @@ void StartupSerializer::SerializeObject(HeapObject* obj, HowToCode how_to_code,
   } else if (obj->IsScript() && Script::cast(obj)->IsUserJavaScript()) {
     Script::cast(obj)->set_context_data(
         isolate_->heap()->uninitialized_symbol());
+  } else if (obj->IsSharedFunctionInfo()) {
+    // Clear inferred name for native functions.
+    SharedFunctionInfo* shared = SharedFunctionInfo::cast(obj);
+    if (!shared->IsSubjectToDebugging() && shared->HasInferredName()) {
+      shared->set_inferred_name(isolate()->heap()->empty_string());
+    }
   }
 
   if (obj->IsHashTable()) CheckRehashability(obj);

test/cctest/test-object.cc

@@ -60,8 +60,8 @@ TEST(NoSideEffectsToString) {
   CheckObject(isolate, factory->null_value(), "null");
 
   CheckObject(isolate, factory->error_to_string(), "[object Error]");
-  CheckObject(isolate, factory->stack_trace_symbol(),
-              "Symbol(stack_trace_symbol)");
+  CheckObject(isolate, factory->unscopables_symbol(),
+              "Symbol(Symbol.unscopables)");
   CheckObject(isolate, factory->NewError(isolate->error_function(),
                                          factory->empty_string()),
               "Error");