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 ee655d2474d3f8563a7b8705a461f165c366a497..e48a84b2a04665eac4b46e6812bbaa976f5e9010 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -1193,7 +1193,7 @@ bool RunMainIsolate(const char* script_name,
     ASSERT(!Dart_IsError(builtin_lib));
     result = Dart_LibraryImportLibrary(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()) {
@@ -1240,7 +1240,6 @@ 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.
       };