Fix +: and -: unpacked array slicing when array has nonzero low index. (#5345) #5387
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Resolves #5345
Subtracts low index of unpacked array from msb & lsb calculations during plus/minus slice replacement. This is necessary when the low index is not zero, and I think was simply missed previously as this may not be a common coding style.
I have updated the existing t_unpacked_slice test so that it defines the source array parameters to have a negative low indices. I believe this should expand test coverage to this particular issue without sacrificing existing coverage. I'm open to this deserving its own test though.
I have done very few pull requests on github so please let me know if I've done something incorrectly here.