tools: Set Swift bug report message in some executable targets

If these programs crash, we want them to print the Swift bug report
message, not the default LLVM one, which leads to
https://github.com/llvm/llvm-project/issues.

While here, hoist the setting of the bug report message to the
START_PROGRAM macro so that we don't forget to set it in the future.

lib/FrontendTool/FrontendTool.cpp

@@ -2,7 +2,7 @@
 //
 // This source file is part of the Swift.org open source project
 //
-// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
 // Licensed under Apache License v2.0 with Runtime Library Exception
 //
 // See https://swift.org/LICENSE.txt for license information
@@ -2259,7 +2259,6 @@ int swift::performFrontend(ArrayRef<const char *> Args,
                            const char *Argv0, void *MainAddr,
                            FrontendObserver *observer) {
   INITIALIZE_LLVM();
-  llvm::setBugReportMsg(SWIFT_CRASH_BUG_REPORT_MESSAGE "\n");
   llvm::EnablePrettyStackTraceOnSigInfoForThisThread();
 
   std::unique_ptr<CompilerInstance> Instance =