Optimise load from spill
Optimise load from spill

Load spilled values directly into the target register rather than
into an intermediate register ( which may cause additional spills)
and the moving the value from the immediate register into the
target register.

Signed-off-by: Mark Ryan <88ffc4093c40652fbbf052f026a8b6147509f0aa@gmail.com>

markdryan/subtilis,markdryan/subtilis