For armv4 - Only the first 4 parameters can be passed via registers
(r0..r3).
As all of the general registers are already used,
r11 was used to store the 'next' param.
R11 is now pushed/poped on entry/exit.
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22719)
