GlobalISel: Fix mishandling vector-as-scalar in return values (#175780) This fixes 2 cases when the AMDGPU ABI is fixed to pass <2 x i16> values as packed on gfx6/gfx7. The ABI does not pack values currently; this is a pre-fix for that change. Insert a bitcast if there is a single part with a different size. Previously this would miscompile by going through the scalarization and extend path, dropping the high element. Also fix assertions in odd cases, like <3 x i16> -> i32. This needs to unmerge with excess elements from the widened source vector. All of this code is in need of a cleanup; this should look more like the DAG version using getVectorTypeBreakdown.
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