This is like `ccorres_rewrite`, but for `hoarep`, and uses the same
infrastructure.
The interaction between the `simpl_rewrite` locale and the
`simpl_rewrite` method was confusing, and didn't work well with multiple
interpretations. We replace the locale with a simple anonymous context
block. Since that puts more things in the global namespace, we rename
many of them. The `simpl_rewrite` method is now parameterised by a `hom`
fact which determines the predicate under which we are rewriting.
This also includes a slight generalisation of `exec_eq_is_valid_eq`,
which allows a similar generalisation of `hoarep_rewrite`.
Signed-off-by: Matthew Brecknell <Matthew.Brecknell@data61.csiro.au>
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