[PATCH] FIx PR16026

[Michael Liao]

Hi

The attach patch fixes PR16026. When DAG combining from (build_vector
(extract_vector_elt ..) ..) to (vector_shuffle), it should be deferred
if one operand of build_vector has patterns of (extract_vector_elt
(shuffle_vector ..)), which could be simplified further.

Thanks for review.
- Michael

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