[vm/shared] Use concurrent-aware write when setting shared field init value.

Fixes #61278
TEST=isolate_group_bound_init_test on TSAN

Change-Id: I31ce9ef57fc75b142edbcfa6b8248b6b9c003324
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/444367
Reviewed-by: Ryan Macnak <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>

Author: aam

runtime/vm/object.cc

@@ -13402,7 +13402,9 @@ void Field::SetStaticValue(const Object& value) const {
 
   SafepointReadRwLocker ml(thread, thread->isolate_group()->program_lock());
   if (is_shared()) {
-    thread->isolate_group()->shared_field_table()->SetAt(id, value.ptr());
+    thread->isolate_group()->shared_field_table()->SetAt(
+        id, value.ptr(),
+        /*concurrent_use=*/true);
   } else {
     thread->isolate()->field_table()->SetAt(id, value.ptr());
   }