[llvm] [PassTimingInfo] Handle nested timers in passes (PR #70165)

[Arthur Eubanks via llvm-commits]

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@@ -55,8 +55,9 @@ class TimePassesHandler {
   /// Map of timers for pass invocations
   StringMap<TimerVector> TimingData;
 
-  /// Currently active pass timer.
-  Timer *ActivePassTimer = nullptr;
+  /// Stack of currently active pass timers. Passes can request other
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aeubanks wrote:

s/request/run/

https://github.com/llvm/llvm-project/pull/70165