[NFCI] DwarfEHPrepare: update DomTree in non-permissive mode, when pr…

…esent

Being stricter will catch issues that would be just papered over
in permissive mode, and is likely faster.

llvm/lib/CodeGen/DwarfEHPrepare.cpp

@@ -243,7 +243,7 @@ bool DwarfEHPrepare::InsertUnwindResumeCalls() {
   new UnreachableInst(Ctx, UnwindBB);
 
   if (DTU && RequireAndPreserveDomTree)
-    DTU->applyUpdatesPermissive(Updates);
+    DTU->applyUpdates(Updates);
 
   return true;
 }