objtool/klp: Add test for kCFI prefix symbols and traps

Two properties, asserted separately because they fail differently:

  - the __cfi_<func> prefix symbol has to be carried with the patched
    function, or the function has no type identity and indirect calls to it
    trap;
  - its .kcfi_traps entry has to be extracted, or the trap is not
    recognised as a CFI failure and a clean report becomes an oops.

test-special-section hand-assembles a .kcfi_traps entry, which is what
makes it catch commit 7df1638df97b ("objtool/klp: Fix .kcfi_traps special
section extraction").  Nothing until now built real kCFI code.

This tests the behavior of commit da4326573ae8 ("objtool/klp: Fix kCFI trap
handling").  Commit f7ceffd21a8a ("objtool/klp: Fix kCFI prefix
finding/cloning") cannot be tested as such, its code having been rewritten
by commit fe6a87e0abac ("objtool: Improve and simplify prefix symbol
detection"); this guards the current implementation's behaviour instead.

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/20260916184351.2720310-42-song@kernel.org

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