Merge branch 'GenFilterTool-clang-llvm9-warnings' into 'master'

DerivationFrameworkMCTruth clang llvm9 fix warnings on inconsistent enum

See merge request atlas/athena!38255

PhysicsAnalysis/DerivationFramework/DerivationFrameworkMCTruth/src/GenFilterTool.cxx

@@ -57,7 +57,7 @@ namespace DerivationFramework {
     ATH_MSG_VERBOSE("Particle has origin " << orig);
 
     switch(orig) {
-    case Unknown:
+    case NonDefined:
     case PhotonConv:
     case DalitzDec:
     case ElMagProc:
@@ -227,4 +227,4 @@ namespace DerivationFramework {
   }
 
 
-} /// namespace
\ No newline at end of file
+} /// namespace