objtool/klp: Add test for EXPORT_SYMBOL_FOR_MODULES references

A symbol exported with EXPORT_SYMBOL_FOR_MODULES() is reachable only by the
modules named in its namespace, and a livepatch module is never one of
them. So a reference to it cannot be an ordinary relocation resolved by the
module loader; it has to be a klp relocation applied at patch time.

Getting this wrong is silent.  The module links, loads, and reads the wrong
thing, or fails to load for a reason that does not name the cause.

This tests the behavior of commit 4cd3cfb8b54f ("objtool/klp: Fix
relocations for EXPORT_SYMBOL_FOR_MODULES() symbols").  Which object the
resulting relocation is filed under is a separate question, and one this
test cannot ask: the patched object here is vmlinux, so the vmlinux section
is the one produced either way.  That is covered by the module case, in
"objtool/klp: Add test for vmlinux relocs in a patched module".

Assisted-by: Claude:claude-opus-4
Based-on-test-by: Joe Lawrence <joe.lawrence@redhat.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20260916184351.2720310-33-song@kernel.org

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