selftests/bpf: Test invariants on JSLT crossing sign

[ Upstream commit f96841b ]

The improvement of the u64/s64 range refinement fixed the invariant
violation that was happening on this test for BPF_JSLT when crossing the
sign boundary.

After this patch, we have one test remaining with a known invariant
violation. It's the same test as fixed here but for 32 bits ranges.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Link: https://lore.kernel.org/r/ad046fb0016428f1a33c3b81617aabf31b51183f.1753695655.git.paul.chaignon@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: pchaigno

tools/testing/selftests/bpf/progs/verifier_bounds.c

@@ -1028,7 +1028,7 @@ l0_%=:	r0 = 0;						\
 SEC("xdp")
 __description("bound check with JMP_JSLT for crossing 64-bit signed boundary")
 __success __retval(0)
-__flag(!BPF_F_TEST_REG_INVARIANTS) /* known invariants violation */
+__flag(BPF_F_TEST_REG_INVARIANTS)
 __naked void crossing_64_bit_signed_boundary_2(void)
 {
 	asm volatile ("					\