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[MIPS GlobalISel] Select 4 byte unaligned load and store
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Authored by Petar.Avramovic on Feb 14 2020, 8:43 AM.

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Summary

Improve legality checks for load and store, 4 byte scalar load and store
are now legal for all subtargets.
During regbank selection 4 byte unaligned loads and stores for MIPS32r5
and older get mapped to gprb.
Select 4 byte unaligned loads and stores for MIPS32r5.
Fix tests that unintentionally had unaligned load or store.

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