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

[Roland Westrelin]

On Thu, 23 Jun 2022 07:17:18 GMT, Christian Hagedorn <chagedorn 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.

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