Revert "bpf: clean up visit_insn()'s instruction processing"

This reverts commit b1c780ed which is
commit 653ae3a8 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I083d407a06bd85594d74aa486969115a74675e1f
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>