Ensure that all descriptors have a valid enumeration index, and replace NextEnumIndex with LastAdde…

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 72cd8328cf34a5f8ef9e3e0b816d67814b31a727..aadff7ada84fb5d7095e9a6a8cc064cf9bee4920 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -1142,7 +1142,7 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   // We got a map in register r0. Get the enumeration cache from it.
   __ bind(&use_cache);
   __ LoadInstanceDescriptors(r0, r1, r2);
-  __ ldr(r1, FieldMemOperand(r1, DescriptorArray::kEnumerationIndexOffset));
+  __ ldr(r1, FieldMemOperand(r1, DescriptorArray::kLastAddedOffset));
   __ ldr(r2, FieldMemOperand(r1, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
   // Set up the four remaining stack slots.