testing/selftests: Add tests for the is_signed_type() macro

Although not documented, is_signed_type() must support the 'bool' and
pointer types next to scalar and enumeration types. Add a selftest that
verifies that this macro handles all supported types correctly.

Cc: Andrew Morton <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Isabella Basso <[email protected]>
Cc: "Jason A. Donenfeld" <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Luc Van Oostenryck <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rasmus Villemoes <[email protected]>
Cc: Sander Vanheule <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Yury Norov <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Tested-by: Isabella Basso <[email protected]>
Acked-by: Rasmus Villemoes <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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