RFR: 8288968: C2: remove use of covariant returns in type.[ch]pp

[Christian Hagedorn]

On Fri, 24 Jun 2022 08:21:18 GMT, Roland Westrelin <roland at openjdk.org> wrote:

> > > Why don't we just change the hotspot codestyle instead? This patch shows that the feature is useful in type.hpp and it does simplify code.
> > 
> > 
> > I was wondering the same thing. The code becomes much cleaner if we would allow this.
> 
> I'll propose a change to the coding style.

Sounds good, thanks for doing that!

-------------

PR: https://git.openjdk.org/jdk/pull/9237