Retain defTree while checking global objects

Author: liufengyun

compiler/src/dotty/tools/dotc/core/Symbols.scala

@@ -82,8 +82,9 @@ object Symbols {
     def retainsDefTree(using Context): Boolean =
       ctx.settings.YretainTrees.value ||
       denot.owner.isTerm ||                // no risk of leaking memory after a run for these
-      denot.isOneOf(InlineOrProxy) ||      // need to keep inline info
-      ctx.settings.YcheckInit.value        // initialization check
+      denot.isOneOf(InlineOrProxy)  ||     // need to keep inline info
+      ctx.settings.YcheckInit.value ||     // initialization check
+      ctx.settings.YcheckInitGlobal.value  // initialization check
 
     /** The last denotation of this symbol */
     private var lastDenot: SymDenotation = _