objtool/klp: Group the klp tests by architecture

Which architecture a test is for is expressed by where it lives: tests are
in generic/ or in a directory named for their architecture, each carrying
its own fixtures, and the runner executes generic/ plus the one that
matches.  A test which cannot apply here is then not run at all, rather
than running in order to announce that it did not.

Layout does this better than a declaration would.  There is no x86_only(),
and no lookup letting a fixtures/<arch>/ file shadow a generic one of the
same name -- an arch-specific test simply carries its own fixtures.

Compilers cannot work the same way: CI varies CC over the same tree, so a
compiler requirement stays a declaration in the test.

What a run leaves out is reported once:

  # not run: 5 tests in x86/ (this run is arm64)

Silence would have been cheaper and wrong.  A run covering less than the
tree holds must not look like a run that covered all of it.

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/20260916184351.2720310-4-song@kernel.org

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