objtool/klp: Add test for a static branch introduced by the patch

Patching a function which already has a static branch and adding one to a
function which had none are different cases.  In the second the
__jump_table entry is itself new, so there is nothing in the original to
correlate it against: klp diff has to carry the entry into the patch from
scratch and reach the key the way it reaches any other vmlinux symbol.

Dropping it is silent.  The patched function keeps a static branch the
kernel never patches, so it takes the same arm forever whatever the key is
set to.

Give the fixture a NEW_KEY knob which puts the whole branch behind PATCHED,
and assert the premise -- that the original really has no __jump_table --
before asserting the result, since otherwise this is just a second copy of
test-jump-label-key.

Verified by making klp diff skip __jump_table when cloning special
sections: the test fails.

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/20260916184351.2720310-49-song@kernel.org

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