VectorICs: VisitClassLiteral needs adjustment for IC slot usage.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 0476aed3144084a7d309289bc55fbe261fca618d..287ad61af8f16c1dac7129c5525105d29f576590 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -1663,9 +1663,10 @@ void AstGraphBuilder::VisitClassLiteralContents(ClassLiteral* expr) {
     DCHECK_NOT_NULL(expr->class_variable_proxy());
     Variable* var = expr->class_variable_proxy()->var();
     FrameStateBeforeAndAfter states(this, BailoutId::None());
-    VectorSlotPair feedback = CreateVectorSlotPair(
-        FLAG_vector_stores ? expr->GetNthSlot(store_slot_index++)
-                           : FeedbackVectorICSlot::Invalid());
+    VectorSlotPair feedback =
+        CreateVectorSlotPair(FLAG_vector_stores && var->IsUnallocated()
+                                 ? expr->GetNthSlot(store_slot_index++)
+                                 : FeedbackVectorICSlot::Invalid());
     BuildVariableAssignment(var, literal, Token::INIT_CONST, feedback,
                             BailoutId::None(), states);
   }