objtool/klp: Add test for ThinLTO symbols sharing a demangled name

A file-local symbol which ThinLTO has to make visible is renamed
helper.llvm.<hash>.  With two such helpers in one link, the original and
the patched object hold two each, all four spelled differently, and
demangling gives "helper" for every one of them -- so the name alone cannot
say which corresponds to which.

Three translation units, two with a static helper of the same name and a
third calling into both, which is what forces the promotion.  Only one
helper changes: paired correctly that means exactly one is cloned, and
paired the wrong way round the other is, or both are.  Had both bodies
changed, both would be cloned either way and the test would prove nothing
-- which is how the first version of this was written.

The outcome is asserted, not the machinery.  With the clang tested here the
pairing survives disabling the .llvm.<hash> suffix map and stubbing out
llvm_suffix() entirely, so no single-line sabotage distinguishes it; the
tiered matcher this case was written for is not needed for this shape.  The
test says so rather than implying otherwise.

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/20260916184351.2720310-59-song@kernel.org

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