perlasm/ppc-xlate.pl: add vmrg[eo]w instructions.
perlasm/ppc-xlate.pl: add vmrg[eo]w instructions.

Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6419)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl