bpf: factor out reg and stack slot propagation into "propagate_liveness_reg"

After code refactor in previous patches, the propagation logic inside the
for loop in "propagate_liveness" becomes clear that they are good enough to
be factored out into a common function "propagate_liveness_reg".

Reviewed-by: Jakub Kicinski <[email protected]>
Signed-off-by: Jiong Wang <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>

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