message: Re-word error message to make sense on all platforms.
diff: @@ -890,13 +890,12 @@ static swift::ASTContext *SetupASTContext(
  // Lazily get the clang importer if we can to make sure it exists in
  // case we need it.
  if (!swift_ast_context->GetClangImporter()) {
  - std::string swift_error = "Fatal Swift ";
  - swift_error +=
  + std::string swift_error =
  swift_ast_context->GetFatalErrors().AsCString("error: unknown error.");
  diagnostic_manager.PutString(eDiagnosticSeverityError, swift_error);
  - diagnostic_manager.PutString(
  - eDiagnosticSeverityRemark,
  - "Swift expressions require OS X 10.10 / iOS 8 SDKs or later.\n");
  + diagnostic_manager.PutString(eDiagnosticSeverityRemark,
  + "Couldn't initialize Swift expression "
  + "evaluator due to previous errors.");
  return nullptr;
  }
  