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9f224ebd9a
* remove `LoweringError` error set from `Emit.zig` - it actually was less than helpful; it's better to either not throw an error since there can be instructions with mismatching operand sizes such as `movsx` or assert on a by instruction-basis. Currently, let's just pass through and see how we fare. * when moving integers into registers, check for signedness and move with zero- or sign-extension if source operand is smaller than 8 bytes. The destination operand is always assumed to be full-width, i.e., 8 bytes. * clean up `airTrunc` a little to match the rest of CodeGen inst implementations.