Wael Yehia 735d721de4 [PowerPC] Fix handling of undefs in the PPC::isSplatShuffleMask query (#145149) ...

Currently, the query assumes that a single undef byte implies the rest of
the `EltSize - 1` bytes are undefs, but that's not always true.
e.g. isSplatShuffleMask(
<0,1,2,3,4,5,6,7,undef,undef,undef,undef,0,1,2,3>, 8) should return
false.

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Co-authored-by: Wael Yehia <wyehia@ca.ibm.com>

2025-06-23 13:22:33 -04:00

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