Don't forget to subtract materialization instructions when computing the offset of the frame pointe…

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index df878d46bf24b22c675c544a76ca1be8610116ab..34826b660862ef5783e393a91751210cb534239f 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -9811,11 +9811,7 @@ intptr_t DeoptInfo::Instruction(intptr_t index) const {
 
 
 intptr_t DeoptInfo::FrameSize() const {
-  intptr_t pos = 0;
-  while (Instruction(pos) == DeoptInstr::kMaterializeObject) {
-    pos++;
-  }
-  return TranslationLength() - pos;
+  return TranslationLength() - NumMaterializations();
 }
 
 
@@ -9832,6 +9828,15 @@ intptr_t DeoptInfo::TranslationLength() const {
 }
 
 
+intptr_t DeoptInfo::NumMaterializations() const {
+  intptr_t pos = 0;
+  while (Instruction(pos) == DeoptInstr::kMaterializeObject) {
+    pos++;
+  }
+  return pos;
+}
+
+
 void DeoptInfo::ToInstructions(const Array& table,
                                GrowableArray<DeoptInstr*>* instructions) const {
   ASSERT(instructions->is_empty());