Thomas Lively fd0557dbf1 [WebAssembly] More convert_low and promote_low codegen ...

The convert_low and promote_low instructions can widen the lower two lanes of a
four-lane vector, but we were previously scalarizing patterns that widened lanes
besides the low two lanes. The commit adds a shuffle to move the widened lanes
into the low lane positions so the convert_low and promote_low instructions can
be used instead of scalarizing.

Depends on D108266.

Differential Revision: https://reviews.llvm.org/D108341

2021-08-19 15:37:12 -07:00

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