DerivationFrameworkSUSY: Fix clang warnings.

    
Don't use references in a range-for if the object must be copised.

PhysicsAnalysis/DerivationFramework/DerivationFrameworkSUSY/src/SUSYGenFilterTool.cxx

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "DerivationFrameworkSUSY/SUSYGenFilterTool.h"
@@ -139,7 +139,7 @@ namespace DerivationFramework {
 
     // Get HT
     genFiltHT = -1;
-    for (const auto& tj : *truthjets) {
+    for (const auto tj : *truthjets) {
       if ( tj->pt()>m_MinJetPt && fabs(tj->eta())<m_MaxJetEta ) {
 	ATH_MSG_VERBOSE("Adding truth jet with pt " << tj->pt()
 			<< ", eta " << tj->eta()
@@ -150,7 +150,7 @@ namespace DerivationFramework {
     }
 
     float MEx(0.), MEy(0.);
-    for (const auto& tp : *tpc){
+    for (const auto tp : *tpc){
       int pdgid = tp->pdgId();
       if (tp->barcode() >= m_SimBarcodeOffset) continue; // Particle is from G4
       if (pdgid==21 && tp->e()==0) continue; // Work around for an old generator bug

PhysicsAnalysis/DerivationFramework/DerivationFrameworkSUSY/src/SUSYSignalTagger.cxx

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "DerivationFrameworkSUSY/SUSYSignalTagger.h"
@@ -98,7 +98,7 @@ namespace DerivationFramework {
     if (!truthP || truthP->empty()) {
       return false;
     }
-    for (const auto& tp : *truthP) {
+    for (const auto tp : *truthP) {
 
       //check ifSUSY particle
       if ((abs(tp->pdgId()) > 1000000 && abs(tp->pdgId()) < 1000007) || // squarkL
@@ -138,7 +138,7 @@ namespace DerivationFramework {
     if (!firstsp && !secondsp) return false; // should find none or two
 
     if (firstsp && firstsp->nChildren() == 1) {
-      for (const auto& tp : *truthP) {
+      for (const auto tp : *truthP) {
         if (tp->barcode() == firstsp->child(0)->barcode() && tp->pdgId() != firstsp->pdgId()) {
           firstsp = tp;
           break;
@@ -147,7 +147,7 @@ namespace DerivationFramework {
     }
 
     if (secondsp && secondsp->nChildren() == 1) {
-      for (const auto& tp : *truthP) {
+      for (const auto tp : *truthP) {
         if (tp->barcode() == secondsp->child(0)->barcode() && tp->pdgId() != secondsp->pdgId()) {
           secondsp = tp;
           break;