Created by: MDevereau
Adds the following instructions to the codec
- SQRDMULH (by element scalar, by element vector, vector scalar)
- SQRDMLAH (by element scalar, by element vector, vector scalar)
- SQRDMULH (by element scalar, by element vector, vector scalar)
- SQSHL (immediate scalar, register scalar, register vector)
- SQXTN (scalar, vector)
- SQXTN2 (vector)
- SQXTUN (scalar, vector)
- SQXTUN2 (vector)
- UQXTN (scalar, vector)
- UQXTN2 (vector)
Issue: #2626