Fix deoptimization address patching in Turbofan to use safepoints.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index e2414d290046927d3d3f4a7e13d3b09e0311d5df..0ec6feb2805e887b6f52a2bd5c8e4ca26be76f03 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -717,19 +717,9 @@ bool Object::IsDeoptimizationInputData() const {
   // the entry size.
   int length = FixedArray::cast(this)->length();
   if (length == 0) return true;
-  if (length < DeoptimizationInputData::kFirstDeoptEntryIndex) return false;
-
-  FixedArray* self = FixedArray::cast(const_cast<Object*>(this));
-  int deopt_count =
-      Smi::cast(self->get(DeoptimizationInputData::kDeoptEntryCountIndex))
-          ->value();
-  int patch_count =
-      Smi::cast(
-          self->get(
-              DeoptimizationInputData::kReturnAddressPatchEntryCountIndex))
-          ->value();
-
-  return length == DeoptimizationInputData::LengthFor(deopt_count, patch_count);
+
+  length -= DeoptimizationInputData::kFirstDeoptEntryIndex;
+  return length >= 0 && length % DeoptimizationInputData::kDeoptEntrySize == 0;
 }