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

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index c9c8eafc470b6e5c05e1f14392282abce7c453b5..94889277252270021172b684d47c3b7ba1a7e7e4 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -2565,6 +2565,10 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
          FieldMemOperand(r0, 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();
@@ -2587,7 +2591,8 @@ 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:
@@ -2620,6 +2625,10 @@ 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());
 }