Matt Arsenault da72822763 GlobalISel: Fix CSEMIRBuilder mishandling constant folds of vectors
This was ignoring the requested result register, resulting in a
missing def when this happened in the IRTranslator. Fixes some crashes
and verifier errors at -O0.

Alternatively we could pass DstOps to the constant fold functions.
2022-01-18 17:21:02 -05:00
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