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Z: bump up the minimum supported CPU #7838

@ehsankianifar

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@ehsankianifar

During build and testing locally, I noticed that the CPU version was set to 'z10' even though I was using a 'z14' machine! As a result, I was not able to access the new machine instructions and needed to manually change the minimum supported version to z14 in order to run my tests. Not sure if it gets the correct CPU version on Jenkins but if it does't, we wont be running some tests (e.g. vector tests). I am creating this issue to discuss that and see if we can bump up the minimum supported CPU.
OMR CPU config:
https://github.com/eclipse-omr/omr/blob/master/compiler/z/env/OMRCPU.hpp

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