[llvm] [llvm-exegesis] Add tablegen support for validation counters (PR #76652)

[Clement Courbet via llvm-commits]

================
@@ -100,6 +105,17 @@ ExegesisEmitter::ExegesisEmitter(RecordKeeper &RK)
   Target = std::string(Targets[0]->getName());
 }
 
+struct ValidationCounterInfo {
+  int64_t EventNumber;
+  StringRef EventName;
+  unsigned PfmCounterID;
+};
+
+bool CompareValidationCounterInfo(ValidationCounterInfo &LHS,
----------------
legrosbuffle wrote:

[nit] `EventNumberLess` ?

Also, `const ValidationCounterInfo&`.

https://github.com/llvm/llvm-project/pull/76652