Fangrui Song af4d76d909 [Support] Reduce globaal variable overhead after #121663 ...

* Construct frequently-accessed TimerLock/DefaultTimerGroup early to
  reduce overhead.
* Rename `aquireDefaultGroup` to `acquireTimerGlobals` and restore
  ManagedStatic::claim. https://reviews.llvm.org/D76099

* Drop mtg::. We use internal linkage, so mtg:: is unneeded and might
  mislead users. In addition, llvm/ code almost never introduces a named
  namespace not in llvm::. Drop mtg::.
* Replace some unique_ptr with optional to reduce overhead.
* Switch to `functionName()`.
* Simplify `llvm::initTimerOptions` and `TimerGroup::constructForStatistics()`

Pull Request: https://github.com/llvm/llvm-project/pull/122429

2025-01-10 17:59:28 -08:00

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