selftests/bpf: Check that narrow stack stores define no slot

The stack liveness analysis records a store as a "def" only for the
4-byte half-slots it covers completely, so a one or two byte store near
the top of the frame must not define anything. Add a test that reads
fp-8, stores one byte at fp-1 and two bytes at fp-4, and reads fp-8
again, expecting no def mark on either store and the second read to
still use fp-8.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20260924165740.2146806-11-memxor@gmail.com

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