Jakub Konka 4a40c0a80c stage2: refactor errors thrown for size mismatch in mirMovImpl
* introduce `EmitResult` wrapper struct for easier manipulation of
  intermediate emit results - this is mainly to track errors such as
  size mismatch between operands
* create an informative `ErrorMsg` directly at the callsite
2021-12-20 17:59:47 +01:00
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