bpf: split check_reg_sane_offset() in two parts

check_reg_sane_offset() is used when verifying operations like:

  dst_reg += src_reg
  ^          ^
  |          '-------- scalar
  '------------------- pointer

To verify range for both dst_reg and src_reg. Split it in two parts:
- one to check a pointer offset
- another to check scalar offset

This would be useful for further refactoring.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260212-ptrs-off-migration-v2-1-00820e4d3438@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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