This change fixes v2i8 lowering for parameters and returned values. As part of this work, I move the lowering for return values to use generic ISD::STORE nodes as these are more flexible and have existing legalization handling. Note that calling a function with v2i8 arguments or returns is still not working but this is left for a subsequent change as this MR is already fairly large. Partially addresses #128853
This directory contains tests for the MIR file format parser and printer. It was necessary to split the tests across different targets as no single target covers all features available in machine IR. Tests for codegen passes should NOT be here but in test/CodeGen/sometarget. As a rule of thumb this directory should only contain tests using 'llc -run-pass none'.