Burn stack in transform functions for SHA2 AMD64 implementations
* cipher/sha256-avx-amd64.S: Burn stack inside transform functions. * cipher/sha256-avx2-bmi2-amd64.S: Ditto. * cipher/sha256-ssse3-amd64.S: Ditto. * cipher/sha512-avx-amd64.S: Ditto. * cipher/sha512-avx2-bmi2-amd64.S: Ditto. * cipher/sha512-ssse3-amd64.S: Ditto.
This change reduces per call overhead for SHA256 & SHA512.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>