Fix FixedDoubleArray crashes in chromebot

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 6cd4f840b93e4abfcd052e2ab71392dda182b2b1..a7a24b0c9eab7afdf8b0f54344167f3e7e480e36 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -617,6 +617,16 @@ class Heap {
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
   MUST_USE_RESULT MaybeObject* CopyFixedArrayWithMap(FixedArray* src, Map* map);
 
+  // Make a copy of src and return it. Returns
+  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
+  MUST_USE_RESULT inline MaybeObject* CopyFixedDoubleArray(
+      FixedDoubleArray* src);
+
+  // Make a copy of src, set the map, and return the copy. Returns
+  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
+  MUST_USE_RESULT MaybeObject* CopyFixedDoubleArrayWithMap(
+      FixedDoubleArray* src, Map* map);
+
   // Allocates a fixed array initialized with the hole values.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.