Merge branch 'bpf-fix-u32-s32-bounds-when-ranges-cross-min-max-boundary'

Eduard Zingerman says:

====================
bpf: Fix u32/s32 bounds when ranges cross min/max boundary

Cover the following cases in range refinement logic for 32-bit ranges:
- s32 range crosses U32_MAX/0 boundary, positive part of the s32 range
  overlaps with u32 range.
- s32 range crosses U32_MAX/0 boundary, negative part of the s32 range
  overlaps with u32 range.

These cases are already handled for 64-bit range refinement.

Without the fix the test in patch 2 is rejected by the verifier.
The test was reduced from sched-ext program.

Changelog:
- v2 -> v3:
  - Reverted da653de268d3 (Paul)
  - Removed !BPF_F_TEST_REG_INVARIANTS flag from
    crossing_32_bit_signed_boundary_2() (Paul)
- v1 -> v2:
  - Extended commit message and comments (Emil)
  - Targeting 'bpf' tree instead of bpf-next (Alexei)

v1: https://lore.kernel.org/bpf/9a23fbacdc6d33ec8fcb3f6988395b5129f75369.camel@gmail.com/T
v2: https://lore.kernel.org/bpf/20260305-bpf-32-bit-range-overflow-v2-0-7169206a3041@gmail.com/
---
====================

Link: https://patch.msgid.link/20260306-bpf-32-bit-range-overflow-v3-0-f7f67e060a6b@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>