Skip making code pages temporarily writable when finalizing the VM isolate loaded from precompiled …

runtime/vm/pages.cc

Index: runtime/vm/pages.cc
diff --git a/runtime/vm/pages.cc b/runtime/vm/pages.cc
index da7ec8059aeb03c5534002221013e17a36e4c5ff..6dc7e9320cd4ea722b2cd4d03175d1055618451a 100644
--- a/runtime/vm/pages.cc
+++ b/runtime/vm/pages.cc
@@ -657,13 +657,15 @@ RawObject* PageSpace::FindObject(FindObjectVisitor* visitor,
 }
 
 
-void PageSpace::WriteProtect(bool read_only) {
+void PageSpace::WriteProtect(bool read_only, bool include_code_pages) {
   if (read_only) {
     // Avoid MakeIterable trying to write to the heap.
     AbandonBumpAllocation();
   }
   for (ExclusivePageIterator it(this); !it.Done(); it.Advance()) {
-    it.page()->WriteProtect(read_only);
+    if ((it.page()->type() != HeapPage::kExecutable) || include_code_pages) {
+      it.page()->WriteProtect(read_only);
+    }
   }
 }