X87: Vector ICs: ClassLiterals need to allocate a vector slot for home objects.

src/x87/full-codegen-x87.cc

Index: src/x87/full-codegen-x87.cc
diff --git a/src/x87/full-codegen-x87.cc b/src/x87/full-codegen-x87.cc
index 2cb448ae2beb7f7284dadbf257c1b938e3b09c9d..4220734a9918ae3f3fa5d5f473ce38297c92968f 100644
--- a/src/x87/full-codegen-x87.cc
+++ b/src/x87/full-codegen-x87.cc
@@ -1606,9 +1606,9 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
 
   AccessorTable accessor_table(zone());
   int property_index = 0;
-  // store_slot_index points to the vector ic slot for the next store ic used.
+  // store_slot_index points to the vector IC slot for the next store IC used.
   // ObjectLiteral::ComputeFeedbackRequirements controls the allocation of slots
-  // and must be updated if the number of store ics emitted here changes.
+  // and must be updated if the number of store ICs emitted here changes.
   int store_slot_index = 0;
   for (; property_index < expr->properties()->length(); property_index++) {
     ObjectLiteral::Property* property = expr->properties()->at(property_index);
@@ -2470,6 +2470,10 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
   __ mov(scratch, FieldOperand(eax, JSFunction::kPrototypeOrInitialMapOffset));
   __ Push(scratch);
 
+  // store_slot_index points to the vector IC slot for the next store IC used.
+  // ClassLiteral::ComputeFeedbackRequirements controls the allocation of slots
+  // and must be updated if the number of store ICs emitted here changes.
+  int store_slot_index = 0;
   for (int i = 0; i < lit->properties()->length(); i++) {
     ObjectLiteral::Property* property = lit->properties()->at(i);
     Expression* value = property->value();
@@ -2491,7 +2495,8 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
     }
 
     VisitForStackValue(value);
-    EmitSetHomeObjectIfNeeded(value, 2);
+    EmitSetHomeObjectIfNeeded(value, 2,
+                              lit->SlotForHomeObject(value, &store_slot_index));
 
     switch (property->kind()) {
       case ObjectLiteral::Property::CONSTANT:
@@ -2519,6 +2524,10 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
 
   // constructor
   __ CallRuntime(Runtime::kToFastProperties, 1);
+
+  // Verify that compilation exactly consumed the number of store ic slots that
+  // the ClassLiteral node had to offer.
+  DCHECK(!FLAG_vector_stores || store_slot_index == lit->slot_count());
 }