[AArch64] Fix Fold of Compare with Right-shifted Value (#127209)
This change folds (setcc ne (lshr x c) 0) for 64-bit types and constants
c >= 32. This fold already existed for other types or smaller constants
but was not applicable to 64-bit types and constants >= 32 due to a
comparison of the constant c with the bit size of the setcc operation.
The type of this operation is legalized to i32, which does not
necessarily match the type of the lshr operation. Use the bit size of
the type of the lshr operation instead for the comparison.
Fixes #122380.
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