RFR: 8368573: MultiBranchNode::required_outcnt should return an unsigned int

[Francesco Andreuzzi]

On Thu, 9 Oct 2025 06:51:50 GMT, Manuel Hässig <mhaessig at openjdk.org> wrote:

> This small PR turns the type `MultiBranchNode::required_outcnt` from an `int` into a `uint` because all usages of this are already unsigned integers. Thus, the patch eliminates all implicit conversion from the code path.
> 
> Testing:
>  - [x] Github Actions
>  - [x] tier1, tier2 on Oracle supported platforms

Marked as reviewed by fandreuzzi (Author).

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PR Review: https://git.openjdk.org/jdk/pull/27714#pullrequestreview-3317913065