Fail sooner and with better error message when attempting precompilation on IA32.

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 305 matching lines @@
 static bool ProcessGenPrecompiledSnapshotOption(
     const char* arg,
     CommandLineOptions* vm_options) {
   ASSERT(arg != NULL);
   if (*arg != '\0') {
     return false;
   }
   // Ensure that we are not already running using a full snapshot.
   if (isolate_snapshot_buffer != NULL) {
     Log::PrintErr("Precompiled snapshots must be generated with"
-                  " dart_no_snapshot.");
+                  " dart_no_snapshot.\n");
     return false;
   }
   has_gen_precompiled_snapshot = true;
   vm_options->AddArgument("--precompile");
   return true;
 }
 
 
 static bool ProcessRunPrecompiledSnapshotOption(
     const char* arg,
@@ skipping 1033 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }