[RDF] Remove uses of RDFRegisters::normalize (deprecate)

This function has been reduced to an identity function for some time.

Author: Krzysztof Parzyszek

llvm/include/llvm/CodeGen/RDFRegisters.h

@@ -110,7 +110,11 @@ namespace rdf {
       return RegMasks.get(Register::stackSlot2Index(R));
     }
 
-    RegisterRef normalize(RegisterRef RR) const;
+    LLVM_ATTRIBUTE_DEPRECATED(RegisterRef normalize(RegisterRef RR),
+      "This function is now an identity function");
+    RegisterRef normalize(RegisterRef RR) const {
+      return RR;
+    }
 
     bool alias(RegisterRef RA, RegisterRef RB) const {
       if (!isRegMaskId(RA.Reg))

llvm/lib/CodeGen/RDFRegisters.cpp

@@ -94,10 +94,6 @@ PhysicalRegisterInfo::PhysicalRegisterInfo(const TargetRegisterInfo &tri,
   }
 }
 
-RegisterRef PhysicalRegisterInfo::normalize(RegisterRef RR) const {
-  return RR;
-}
-
 std::set<RegisterId> PhysicalRegisterInfo::getAliasSet(RegisterId Reg) const {
   // Do not include RR in the alias set.
   std::set<RegisterId> AS;

llvm/lib/Target/Hexagon/HexagonOptAddrMode.cpp

@@ -246,7 +246,7 @@ void HexagonOptAddrMode::getAllRealUses(NodeAddr<StmtNode *> SA,
   for (NodeAddr<DefNode *> DA : SA.Addr->members_if(DFG->IsDef, *DFG)) {
     LLVM_DEBUG(dbgs() << "\t\t[DefNode]: "
                       << Print<NodeAddr<DefNode *>>(DA, *DFG) << "\n");
-    RegisterRef DR = DFG->getPRI().normalize(DA.Addr->getRegRef(*DFG));
+    RegisterRef DR = DA.Addr->getRegRef(*DFG);
 
     auto UseSet = LV->getAllReachedUses(DR, DA);
 

llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp

@@ -369,7 +369,7 @@ X86LoadValueInjectionLoadHardeningPass::getGadgetGraph(
 
           // Use RDF to find all the uses of `Def`
           rdf::NodeSet Uses;
-          RegisterRef DefReg = DFG.getPRI().normalize(Def.Addr->getRegRef(DFG));
+          RegisterRef DefReg = Def.Addr->getRegRef(DFG);
           for (auto UseID : L.getAllReachedUses(DefReg, Def)) {
             auto Use = DFG.addr<UseNode *>(UseID);
             if (Use.Addr->getFlags() & NodeAttrs::PhiRef) { // phi node