RFR: 8326085: Remove unnecessary UpcallContext constructor

[Thomas Stuefe]

On Fri, 26 Apr 2024 17:42:48 GMT, Sonia Zaldana Calles <szaldana at openjdk.org> wrote:

> Hi all, 
> 
> This PR removes the explicit constructor to UpcallContext (hotspot/share/prims/upcallLinker.cpp) that was added as workaround for [8286891](https://bugs.openjdk.org/browse/JDK-8286891). 
> 
> The minimum required version of XLC has since been bumped in [8325880](https://bugs.openjdk.org/browse/JDK-8325880), so we can remove this. 
> 
> Thanks, 
> Sonia

@JoKern65 tested and its fine.

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Marked as reviewed by stuefe (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18982#pullrequestreview-2105779590