[runtime] Allocate space for computed property names

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 5432b605972e129510b419d7a27c7ce34d70cf2f..33230ac56b724b7bde6411f9a2de76203d817dc6 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9809,6 +9809,20 @@ void FixedArray::CopyTo(int pos, FixedArray* dest, int dest_pos, int len) {
   }
 }
 
+int const ConstantProperties::number_of_properties() {
+  if (has_number_of_properties()) {
+    return Smi::cast(this->get(FixedArray::length() - 1))->value();
+  }
+  return FixedArray::length() / 2;
+}
+
+int const ConstantProperties::length() {
+  return FixedArray::length() - (this->has_number_of_properties() ? 1 : 0);

[Toon Verwaest, 2017/01/18 08:49:53]

Perhaps better to not call this length; it's a little confusing this overlaps
with FixedArray::length.

[Franzi, 2017/01/18 14:23:10]

Done. Using size() which is intuitive for lists and not conflicting with the
underlying length. 

+}
+
+bool const ConstantProperties::has_number_of_properties() {
+  return FixedArray::length() % 2 != 0;
+}
 
 #ifdef DEBUG
 bool FixedArray::IsEqualTo(FixedArray* other) {