LSQ Unit: After deleting part of a split request, set it to NULL so that it isn't accidentally deleted again later (causing a segmentation fault).
LSQ Unit: After deleting part of a split request, set it to NULL so that it
isn't accidentally deleted again later (causing a segmentation fault).

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin