[turbofan] Add Symbol feedback to Equal/StrictEqual.

src/type-info.cc

Index: src/type-info.cc
diff --git a/src/type-info.cc b/src/type-info.cc
index 0b8dd147bd35f46835c9c244906eb4acc0af6e4f..246822838353ca0d0a4f42dbd3bdd6c7f448b8e3 100644
--- a/src/type-info.cc
+++ b/src/type-info.cc
@@ -191,6 +191,8 @@ AstType* CompareOpHintToType(CompareOperationHint hint) {
       return AstType::InternalizedString();
     case CompareOperationHint::kString:
       return AstType::String();
+    case CompareOperationHint::kSymbol:
+      UNREACHABLE();
     case CompareOperationHint::kReceiver:
       return AstType::Receiver();
     case CompareOperationHint::kAny: