cpu: Result refactoring

The Result union used to collect the result of an instruction is now a
class of its own, with its constructor, and explicit casting methods for
cleanliness.

This is also a stepping stone to have vector registers, and instructions
that produce a vector register as output.

Change-Id: I6f40c11cb5e835d8b11f7804a4e967aff18025b9
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2703
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

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