Precompilation: Make missing entry points an error.

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index 77625d80cb43adcef525d7e9007e74761c9d2d7b..6ddad2f1f1b433e24dfbb97399c07d4d2cf97e71 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -1177,7 +1177,7 @@ bool RunMainIsolate(const char* script_name,
         reinterpret_cast<IsolateData*>(Dart_IsolateData(isolate));
     result = Dart_LibraryImportLibrary(
         isolate_data->builtin_lib(), root_lib, Dart_Null());
-    if (has_gen_precompiled_snapshot) {
+    if (has_noopt || has_gen_precompiled_snapshot) {
       // Load the embedder's portion of the VM service's Dart code so it will
       // be included in the precompiled snapshot.
       if (!VmService::LoadForGenPrecompiled()) {
@@ -1224,7 +1224,6 @@ bool RunMainIsolate(const char* script_name,
         { "dart:io", "_SecureFilterImpl", "get:ENCRYPTED_SIZE" },
         { "dart:io", "_SecureFilterImpl", "get:SIZE" },
         { "dart:vmservice_io", "::", "main" },
-        { "dart:vmservice_io", "::", "boot" },
         { NULL, NULL, NULL }  // Must be terminated with NULL entries.
       };