[clang] [llvm] [llvm][NFC] Rework Timer.cpp globals to ensure valid lifetimes (PR #121663)

[Fangrui Song via cfe-commits]

================
@@ -115,22 +92,12 @@ std::unique_ptr<raw_ostream> llvm::CreateInfoOutputFile() {
   return std::make_unique<raw_fd_ostream>(2, false); // stderr.
 }
 
-namespace {
-struct CreateDefaultTimerGroup {
-  static void *call() {
-    return new TimerGroup("misc", "Miscellaneous Ungrouped Timers");
-  }
-};
-} // namespace
-static ManagedStatic<TimerGroup, CreateDefaultTimerGroup> DefaultTimerGroup;
-static TimerGroup *getDefaultTimerGroup() { return &*DefaultTimerGroup; }
-
 
//===----------------------------------------------------------------------===//
 // Timer Implementation
 
//===----------------------------------------------------------------------===//
 
 void Timer::init(StringRef TimerName, StringRef TimerDescription) {
-  init(TimerName, TimerDescription, *getDefaultTimerGroup());
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MaskRay wrote:

I think we need to restore the access to ManagedStatic::claim. Done by #122429

https://github.com/llvm/llvm-project/pull/121663
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