AArch64: Enable extended MIR

This patch enables all the extended MIR opcodes for ARM64. Please note
that currently the compiler will never generate these opcodes since the
BB optimisations are not enabled.

Change-Id: Ia712b071f62301db868297d37567795128b5bf2e
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>
4 files changed