bpf: fix cbranch miscompilation in CPUv1 [PR122141]

bpf: fix cbranch miscompilation in CPUv1 [PR122141]

As diagnosed by Andrew in the linked PR, when reversing the branch
condition to work around lack of some cbranch instructions, we must
use swap_condition rather than reverse_condition.

	PR target/122141

gcc/

	* config/bpf/bpf.cc (bpf_expand_cbranch): Use swap_condition
	rather than reverse_condition when reversing jump condition to
	work around missing instructions in very old BPF ISAs.

gcc/testsuite/

	* gcc.target/bpf/pr122141-1.c: New.
	* gcc.target/bpf/pr122141-2.c: New.

Suggested-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>