Add `MINIMAL` pragma for `MArray`

The default definition for newArray uses unsafeNewArray_, whose default definition uses newArray, so a MINIMAL pragma is required to avoid infinite recursion.

Make sense, thanks!

approved this merge request

added 2 commits

• 9ebca4c2 - 1 commit from branch ghc/packages:master
• 77b26590 - Add `MINIMAL` pragma for `MArray`

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