objtool/klp: Add klp diff and post-link regression tests

Five tests covering behaviour the harness could reach but nothing
exercised.  Each was verified to fail against the code it guards, by
reverting the fix or sabotaging the exact line; where a first attempt
passed against broken code, the fixture was wrong and was rebuilt.

  post-link                    first coverage of the subcommand at all
  local-vs-export              local symbols must not match exports
  symvers-parse-error          Module.symvers parse error line numbers
  checksum-debug               the --debug-checksum format klp-build reads
  function-removal             the "no correlation" path

local-vs-export tests the behavior of commit 86a697572c62 ("objtool/klp:
Don't match local symbols against exports"), and symvers-parse-error that
of commit 51c1de134863 ("objtool/klp: Fix line numbers in Module.symvers
parse errors").

Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Assisted-by: Claude:claude-opus-5
Link: https://patch.msgid.link/20260916184351.2720310-28-song@kernel.org

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