bpf: JIT helpers for fmod_ret progs

* Split the invoke_bpf program to prepare for special handling of
  fmod_ret programs introduced in a subsequent patch.
* Move the definition of emit_cond_near_jump and emit_nops as they are
  needed for fmod_ret.
* Refactor branch target alignment into its own generic helper function
  i.e. emit_align.

Signed-off-by: KP Singh <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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