[turbofan] Add Symbol feedback to Equal/StrictEqual.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 1691f1618fc1e7b1486c856195fdfca078e7a187..658c32a5b0a67b75a2bae68db7532da44e0f0c1f 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -992,6 +992,18 @@ class RepresentationSelector {
     }
   }
 
+  void VisitCheck(Node* node, Type* type, SimplifiedLowering* lowering) {
+    if (InputIs(node, type)) {
+      VisitUnop(node, UseInfo::AnyTagged(),
+                MachineRepresentation::kTaggedPointer);
+      if (lower()) DeferReplacement(node, node->InputAt(0));
+    } else {
+      VisitUnop(node, UseInfo::CheckedHeapObjectAsTaggedPointer(),
+                MachineRepresentation::kTaggedPointer);
+    }
+    return;
+  }
+
   void VisitCall(Node* node, SimplifiedLowering* lowering) {
     const CallDescriptor* desc = CallDescriptorOf(node->op());
     int params = static_cast<int>(desc->ParameterCount());
@@ -2390,14 +2402,7 @@ class RepresentationSelector {
         return;
       }
       case IrOpcode::kCheckInternalizedString: {
-        if (InputIs(node, Type::InternalizedString())) {
-          VisitUnop(node, UseInfo::AnyTagged(),
-                    MachineRepresentation::kTaggedPointer);
-          if (lower()) DeferReplacement(node, node->InputAt(0));
-        } else {
-          VisitUnop(node, UseInfo::CheckedHeapObjectAsTaggedPointer(),
-                    MachineRepresentation::kTaggedPointer);
-        }
+        VisitCheck(node, Type::InternalizedString(), lowering);
         return;
       }
       case IrOpcode::kCheckNumber: {
@@ -2410,14 +2415,7 @@ class RepresentationSelector {
         return;
       }
       case IrOpcode::kCheckReceiver: {
-        if (InputIs(node, Type::Receiver())) {
-          VisitUnop(node, UseInfo::AnyTagged(),
-                    MachineRepresentation::kTaggedPointer);
-          if (lower()) DeferReplacement(node, node->InputAt(0));
-        } else {
-          VisitUnop(node, UseInfo::CheckedHeapObjectAsTaggedPointer(),
-                    MachineRepresentation::kTaggedPointer);
-        }
+        VisitCheck(node, Type::Receiver(), lowering);
         return;
       }
       case IrOpcode::kCheckSmi: {
@@ -2433,14 +2431,11 @@ class RepresentationSelector {
         return;
       }
       case IrOpcode::kCheckString: {
-        if (InputIs(node, Type::String())) {
-          VisitUnop(node, UseInfo::AnyTagged(),
-                    MachineRepresentation::kTaggedPointer);
-          if (lower()) DeferReplacement(node, node->InputAt(0));
-        } else {
-          VisitUnop(node, UseInfo::CheckedHeapObjectAsTaggedPointer(),
-                    MachineRepresentation::kTaggedPointer);
-        }
+        VisitCheck(node, Type::String(), lowering);
+        return;
+      }
+      case IrOpcode::kCheckSymbol: {
+        VisitCheck(node, Type::Symbol(), lowering);
         return;
       }