objtool/klp: Test rejection of a file-local static branch key

A static branch key owned by a module cannot be reached with a klp reloc:
late module patching allows the livepatch module to load first, leaving the
__jump_table entry unresolved for jump_label_add_module() to dereference.
validate_special_section_klp_reloc() rejects it at build time.

test-jump-label-module-key covers that for a global key.  A file-local one
takes a different route to the same check: the compiler references a static
through its section symbol plus an addend, so the key has to be resolved
from the section before it can be recognised as STT_OBJECT at all.  Until
commit f9fb44b0ecef ("objtool/klp: Fix detection of corrupt static
branch/call entries") it was not, and the reference was silently emitted.

Give the fixture a STATIC_KEY knob and cover it.  The test checks that the
input really does reference the key through its section, since without that
it is only a second copy of the existing test.

Verified by reverting commit f9fb44b0ecef ("objtool/klp: Fix detection of
corrupt static branch/call entries"): klp diff accepts the input and the
test fails, under both gcc and clang.

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/20260916184351.2720310-44-song@kernel.org

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