Amara Emerson 55e760769b [GlobalISel] Fold away G_BUILD_VECTOR with all elements extracted. ...

If every element is extracted from a G_BUILD_VECTOR, pass through the source
registers. This is different to the extract(build_vector) combine because this
one tolerates multiple users as long as they're exhaustive.

Differential Revision: https://reviews.llvm.org/D97890

2021-03-09 11:34:26 -08:00

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