[lld] [LLD][COFF] Handle --start-lib/--end-lib group in the same way as other archives (PR #136496)

[Jacek Caban via llvm-commits]

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@@ -2553,9 +2595,11 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
 
         if (args.hasArg(OPT_include_optional)) {
           // Handle /includeoptional
-          for (auto *arg : args.filtered(OPT_include_optional))
-            if (isa_and_nonnull<LazyArchive>(symtab.find(arg->getValue())))
+          for (auto *arg : args.filtered(OPT_include_optional)) {
+            Symbol *sym = ctx.symtab.find(arg->getValue());
+            if (sym && (isa<LazyArchive>(sym) || isa<LazyObject>(sym)))
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cjacek wrote:

It would be good to have a test case for that.

https://github.com/llvm/llvm-project/pull/136496