[TableGen] Fix D90844 introduced non-determinism due to iteration over a std::map over allocated object pointers

993eaf2 (D90844) is still wrong.
The allocated const Record* pointers do not have an order guarantee
so switching from DenseMap to std::map does not help.

ProcModelMapTy = std::map<const Record*, unsigned>

Sort the values instead.

Author: MaskRay

llvm/utils/TableGen/CodeGenSchedule.cpp

@@ -1718,6 +1718,9 @@ std::vector<unsigned> CodeGenSchedModels::getAllProcIndices() const {
   for (const auto &PM : ProcModelMap)
     if (PM.second != 0)
       ProcIdVec.push_back(PM.second);
+  // The order of the keys (Record pointers) of ProcModelMap are not stable.
+  // Sort to stabalize the values.
+  llvm::sort(ProcIdVec);
   return ProcIdVec;
 }
 

llvm/utils/TableGen/CodeGenSchedule.h

@@ -410,7 +410,7 @@ class STIPredicateFunction {
   ArrayRef<OpcodeGroup> getGroups() const { return Groups; }
 };
 
-using ProcModelMapTy = std::map<const Record*, unsigned>;
+using ProcModelMapTy = DenseMap<const Record *, unsigned>;
 
 /// Top level container for machine model data.
 class CodeGenSchedModels {