TurboFan: Introduce TaggedSigned and TaggedPointer representations.

src/compiler/load-elimination.cc

Index: src/compiler/load-elimination.cc
diff --git a/src/compiler/load-elimination.cc b/src/compiler/load-elimination.cc
index d922d3268e42344018b77e5b9708f78cecde23fc..ad787f80928be553075a3e130fd534b9fc478eaa 100644
--- a/src/compiler/load-elimination.cc
+++ b/src/compiler/load-elimination.cc
@@ -514,6 +514,8 @@ Reduction LoadElimination::ReduceStoreElement(Node* node) {
       break;
     case MachineRepresentation::kFloat64:
     case MachineRepresentation::kSimd128:
+    case MachineRepresentation::kTaggedSigned:
+    case MachineRepresentation::kTaggedPointer:
     case MachineRepresentation::kTagged:
       state = state->AddElement(object, index, new_value, zone());
       break;
@@ -688,6 +690,9 @@ int LoadElimination::FieldIndexOf(FieldAccess const& access) {
       return -1;  // Currently untracked.
     case MachineRepresentation::kFloat64:
     case MachineRepresentation::kSimd128:
+      return -1;  // Currently untracked.
+    case MachineRepresentation::kTaggedSigned:
+    case MachineRepresentation::kTaggedPointer:
     case MachineRepresentation::kTagged:
       // TODO(bmeurer): Check that we never do overlapping load/stores of
       // individual parts of Float64/Simd128 values.