LayoutDescriptorHelper is now able to calculate the length of contiguous regions of tagged/non-tagg…

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 09eba59d3331f8e04497e7c3786163f8220c791f..f5bc0fdc440da2061770a4cc001bff9b8bba194e 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -2754,7 +2754,7 @@ void MarkCompactCollector::MigrateObject(HeapObject* dst, HeapObject* src,
 
     bool may_contain_raw_values = src->MayContainRawValues();
 #if V8_DOUBLE_FIELDS_UNBOXING
-    InobjectPropertiesHelper helper(src->map());
+    LayoutDescriptorHelper helper(src->map());
     bool has_only_tagged_fields = helper.all_fields_tagged();
 #endif
     for (int remaining = size / kPointerSize; remaining > 0; remaining--) {