8352292: Implement NMT tags using hashtables

[gerard-ziemski]

This is a follow-up to #21843. Here we are focusing on removing the mem tag paremeter with default value of mtNone, to force everyone to provide mem tag, if known.

I tried to fill in tag, when I was pretty certain that I had the right type.

At least one more follow-up will be needed after this, to change the remaining mtNone to valid values.

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Issue

• JDK-8352292: Implement NMT tags using hashtables (Enhancement - P4)

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