arch-power: Add fields for VA form instructions

This introduces the extended opcode field for VA form
instructions and the RC field that specifes a GPR to
be used as a register operand.

Change-Id: Ibc63b7392cb552613c755463fb34f2ee2362b2b6
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40904
Reviewed-by: Boris Shingarov <shingarov@labware.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed