Enable Cat of Zero Element Vec (bp #1623) #1627
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* Return 0.U for asUInt of a zero-element Seq Add a condition to SeqUtils.asUInt to have it return an unspecified width 0.U when applied to an empty sequence. This enables the ability to do a Cat of a zero-element sequence. Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com> * Test elaboration of Cat on zero-element Seq Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com> (cherry picked from commit ac641fb)
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