tree 200a3692df4975b536128e9788b2eacbcb9b68bf
parent 406450573f0bcf55a54f6188e9080c194cb22e58
author peter klausler <pklausler@nvidia.com> 1634751429 -0700
committer Copybara-Service <copybara-worker@google.com> 1634924673 -0700

[flang] Fix bogus folding error for ISHFT(x, negative)

Negative shift counts are of course valid for ISHFT when
shifting to the right.  This patch decouples the folding of
ISHFT from that of SHIFTA/L/R and adds tests.

Differential Revision: https://reviews.llvm.org/D112244

GitOrigin-RevId: d5074c7166647ea1abd78f5bb7fd876cbf0bb7d1