[PATCH] lto: Set plugin_format to bfd_plugin_no only if known_used is set

[H.J. Lu]

commit b21318bd2c29fcca8f99c1de7facdaa5cb2e66e2
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu May 11 14:31:09 2023 +0000

    Add LDPT_REGISTER_CLAIM_FILE_HOOK_V2 linker plugin hook [GCC PR109128]

added the LDPT_REGISTER_CLAIM_FILE_HOOK_V2 linker plugin hook support
for offload support.  Since the V2 linker plugin hook doesn't claim
the offload IR if known_used is unset, set input plugin_format to
bfd_plugin_no only if known_used is set or the V2 linker plugin hook
is unused.

PR ld/33584
* plugin.c (plugin_object_p): Set plugin_format to bfd_plugin_no
only if known_used is set or the V2 linker plugin hook is unused.

OK for master?

Thanks.

H.J.
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