[clang] [llvm] Use global TimerGroups for both new pass manager and old pass manager timers (PR #130375)

[Arthur Eubanks via cfe-commits]

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@@ -62,16 +62,13 @@ class PassTimingInfo {
 
 private:
   StringMap<unsigned> PassIDCountMap; ///< Map that counts instances of passes
-  DenseMap<PassInstanceID, std::unique_ptr<Timer>> TimingData; ///< timers for pass instances
-  TimerGroup TG;
+  DenseMap<PassInstanceID, Timer *> TimingData; ///< timers for pass instances
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aeubanks wrote:

I think we still want PassTimingInfo to own the Timers, so keep `unique_ptr`?

https://github.com/llvm/llvm-project/pull/130375