Omit write barrier when setting trimmed elements.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 122fbba2c4aac4464c2a5bc1d37cf66d283b30bb..feb912f4147754a7ebc2f09c60dc65f18b22ef0a 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -495,7 +495,9 @@ BUILTIN(ArrayShift) {
   }
 
   if (Heap::new_space()->Contains(elms)) {
-    array->set_elements(LeftTrimFixedArray(elms));
+    // As elms still in the same space they used to be (new space),
+    // there is no need to update remembered set.
+    array->set_elements(LeftTrimFixedArray(elms), SKIP_WRITE_BARRIER);
   } else {
     // Shift the elements.
     AssertNoAllocation no_gc;